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Archives For November 30, 1999

How to Hide Your App Icon in Ubuntu 24.04 | 22.04

Last updated: May 24, 2024 — Leave a comment

Got an application, but you want to make it in-visible from start menu, app grid, app launcher and dock? Here’s how to do the trick in Ubuntu 24.04, Ubuntu 22.04, Ubuntu 20.04, though it should also work in most other Linux.

It’s easy to do the trick by adding a rule into the ‘.desktop’ file for that application. It’s:

NoDisplay=true – hide app icon from app launcher, but still visible from associated files’ “Open With” dialog.
Hidden=true – complete hide the app, unless launching from command line.

For GNOME, the default desktop environment for Ubuntu, there’s also an extension can do the job by adding option to app icon’s right-click menu.

Method 1: Hide App Icon by Configuring the .desktop Shortcut file

1. Locate the .desktop shortcut file

First, you have to find out where and the file-name of the shortcut file for your application.

To do so, press Ctrl+Alt+T on keyboard to open terminal. When terminal opens, run command to install plocate (or mlocate for Ubuntu 20.04):
```
sudo apt install plocate && sudo updatedb
```
Then, run command to locate the shortcut file for your app (mpv for example):
```
locate "*mpv*desktop"
```
In this command, it will output any file-name that contains “mpv” (change the keyword depends on your app name) in between, and ends with ‘desktop’.

The command may output multiple files, choose one according to file PATH:

for native .deb apps, the shortcut files are usually installed to:
- /usr/share/applications
- /usr/local/share/applications
- or .local/share/applications
for Snap apps, looking for /var/lib/snapd/desktop/applications directory.
for Flatpak apps, they are usually installed to:
- /var/lib/flatpak/exports/share/applications/
- or .local/share/flatpak/exports/share/applications/

2. One command to hide the app icon

Once you found out the app shortcut file, hide it simply by running command:

sudo desktop-file-edit --set-key=NoDisplay --set-value=true /usr/share/applications/mpv.desktop

In last command:

replace NoDisplay with Hidden to also hide it from ‘Open With’ dialog.
replace “/usr/share/applications/mpv.desktop” according to last step.
skip sudo for the shortcut located in .local/ sub-directories.

Besides using desktop-file-edit command, you may edit the shortcut file using your favorite text editor, for example, run:

sudo gedit /usr/share/applications/mpv.desktop

Replace gedit with gnome-text-editor for 24.04. Then, add either NoDisplay=true or Hidden=true under “[Desktop Entry]”.

The app icon should disappear a few seconds later. If NOT, try refreshing the database by running command sudo update-desktop-database.

Step 2: Use Extension to Hide App Icon (GNOME Only)

For Ubuntu 22.04, Ubuntu 24.04, and other Linux with GNOME 42 and higher, there’s an extension to make the process easier.

1. First, search for and install “Extension Manager” from either Ubuntu Software or App Center.

Install Extension Manager in Ubuntu Software/App Center

2. Then, launch “Extension Manager”. Navigate to “Browse” tab, then search & install “App Hider” extension.

Other Linux can go to extension web page, and use ON/OFF switch to install it.

3. After installation, right-click on desired app icon in the “Show Applications” screen and select “hide”.

Right-click app icon to hide

For choice, user can launch “Gnome Extensions” or “Extensions Manager” to open the Preferences dialog. There, it lists all hidden apps as well as un-hide options.

In Howtos shortcut

Panorama photo stitcher – Hugin 2022 in Beta Now [Ubuntu PPA]

Last updated: November 26, 2022 — Leave a comment

Hugin, the popular free and open-source panorama photo stitcher application, now is in beta stage for the upcoming 2022 version.

Changes in this release according to the launchpad milestone include:

Add simple edge fill option to fill black edges in panorama with homogenous color.
Simplified the assistant page with only the necessary GUI controls to make it more clear for beginners and casual users.
Several improvements to control points tab (e.g. magnifier displays now warped image for better judgement of wide angle/fisheye images).
Improved handling of duplicate control points when running cpfind.
Extended command line tools pto_mask (--delete-mask) and pano_modify (allow specifying crop relative to canvas size).

There are as well some bug-fixes in the release, including fulla flatfield extremely dark, and high DPI display support for Windows.

How to install Hugin 2022 in Ubuntu:

For the source tarball as well as Windows msi packages, go the sourceforge download page.

For all current Ubuntu releases, including Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, Ubuntu 22.10, and their based systems, I’ve made the unofficial package into this PPA repository.

I’ll continue updating this PPA when the stable release is out! And sync the package (stable) with may apps ppa.

1. First, press Ctrl+Alt+T on keyboard to open terminal. When it opens, run command to add the PPA:

sudo add-apt-repository ppa:ubuntuhandbook1/hugin

Type user password (no asterisk feedback) when it asks and hit Enter to continue.

2. Update system package cache for Ubuntu 18.04 and Linux Mint, though it’s done automatically while adding PPA in Ubuntu 20.04+:

sudo apt update

3. Finally, either run the command below in terminal to install the panorama photo stitcher:

sudo apt install hugin

Or, upgrade the software (if an old version was installed) via Software Updater (Update Manager) app:

Uninstall hugin:

To remove the software package, simply run command:

sudo apt remove --autoremove hugin hugin-data

And, remove the PPA either by running command in terminal:

sudo add-apt-repository --remove ppa:ubuntuhandbook1/hugin

Or remove the source line from ‘Software & Updates‘ utility under Other Software tab.

In Howtos photo

Add Gnome Tweaks, Extensions App into System Menu in Ubuntu 24.04/22.04

Last updated: May 24, 2024 — Leave a comment

Use Gnome Tweak tool and/or Extensions app frequently? You can add them into top-right corner system menu in Ubuntu 20.04, Ubuntu 22.04, and Ubuntu 24.04.

Meaning you don’t have to search for and launch it every time from ‘Activities’ overview or ‘Show Applications’ screen. Like the built-in ‘Settings’ (Gnome Control Center), just click on top-right corner menu to launch your desired configuration tool.

This is implemented by an extension called “Tweaks & Extensions in System Menu”, which support GNOME version so far up to v46. ~~Sadly, not updated at the moment for GNOME 43 which is default in Ubuntu 22.10 & Fedora 37.~~

Install the Extension to add system menu options

For Ubuntu 22.04 and higher, first search for and install ‘Extension Manager’ from Ubuntu Software or App Center.

Install Extension Manager in Ubuntu 22.04+

Then launch “Extension Manager” and use it to install the ‘Tweaks in system menu’ extension under ‘Browse’ tab.

Finally, switch back to ‘Installed’ tab, and click on gear button for that extension to open the configuration dialog. Where you can TURN ON/OFF either option and set its position.

For Ubuntu 20.04 and old Ubuntu 18.04 (not tested), first open terminal by press Ctrl+Alt+T shortcut key on keyboard. And, run command:

sudo apt install chrome-gnome-shell

Then, use the ON/OFF switch to install it via the link page below:

Of course, you must have Gnome Tweak tool and Extensions app installed from Ubuntu Software, to make them visible in the system menu.

In Howtos Gnome

Show User Avatar in Top-right System Menu in Ubuntu 24.04

Last updated: May 7, 2024 — Leave a comment

For Ubuntu 24.04 and Fedora Workstation with default GNOME 43 ~ 46, there’s now an extension to add user’s icon or figure (aka avatar) to the top-right corner system tray menu, which is also known as quick settings.

With it, the ‘Quick Settings’ menu will look like the screenshot below shows you. The avatar can be either in left or right. By clicking on it, will launch System Settings (Gnome Control Center) and automatically navigate to user settings page.

In Howtos Gnome

[Quick Fix] Dual-boot OS disappeared after installing Ubuntu 24.04 Updated

Last updated: May 4, 2024 — 4 Comments

After installing Ubuntu since 22.10 and higher, the dual-boot Windows 10 and other OSes may be disappeared from the startup boot menu. If you run into that issue, here’s the quick tip to fix it.

This is definitely not bug, but a policy change since GNU Grub 2.06. The default boot-loader uses external os-prober tool to discover other operating systems on the same machine. However, the feature is disabled now for security reason due to the manual:

It is disabled by default since automatic and silent execution of os-prober, and creating boot entries based on that data, is a potential attack vector. Set this option to ‘false’ to enable this feature in the grub-mkconfig command.

By reloading the config will prompt your that “Warning: os-prober will not be executed to detect other bootable pertitions“.

Ubuntu 22.04 is the first release uses GRUB 2.06, which however not affected in my case. So I didn’t encounter this issue until trying Ubuntu 22.10 today on dual-boot machine. And, here’s how to fix the the ‘issue’ in 2 ways.

Option 1: Manually re-enable OS-PROBER

As mentioned in the manual, just set the ‘GRUB_DISABLE_OS_PROBER’ option to ‘false’ in Grub configuration will do the trick.

1. First, press Ctrl+Alt+T on keyboard to open a terminal window. When it opens, run command to edit the Grub config file:

sudo nano /etc/default/grub

Ubuntu 22.10 and higher switched to gnome-text-editor ~~which however does not work along-with sudo from command line.~~ So here I use nano command line text editor instead.

2. When the file opens in terminal window, scroll down and add the new line (or change the value if the line already exists):

GRUB_DISABLE_OS_PROBER=false

After that, save changes by pressing Ctrl+X, type y and hit Enter.

3. Finally, run sudo update-grub to reload the change.

Don’t know why, but Windows OS appears in boot-menu again after I did restart computer twice in my case.

Option 2: Use Grub-Customizer (graphical tool)

For those who prefer using a graphical configuration tool, there’s a third-party Grub-Customizer app available for choice.

1. First, you still need to open terminal (Ctrl+Alt+T) and run 3 commands one by one to install the tool from developer’s PPA:

sudo add-apt-repository ppa:danielrichter2007/grub-customizer

sudo apt update

sudo apt install grub-customizer

2. Search for and launch grub customizer from system start menu or ‘Activities’ overview.

3. When the app opens, navigate to ‘General Settings‘ page, then do:

click on bottom right advanced settings option.
in next pop-up dialog, click “Add” (or edit if exists) and type:
- name: GRUB_DISABLE_OS_PROBER
- value: false

Close advanced settings dialog, and finally click “Save” button in the app to apply change.

In Howtos grub

How to Reboot directly into another OS from Ubuntu 24.04 | 22.04

Last updated: May 6, 2024 — 1 Comment

This simple tutorial shows how to reboot your machine into another OS or grub boot menu entry directly from Ubuntu.

Say you have Ubuntu dual- or multi-boot with other operating systems, and want to reboot directly into a specific OS when working done in current Ubuntu. Or you want to reboot with another Kernel or maybe recovery mode without any keyboard press while booting. This tutorial may help.

Method 1: Single command to reboot into another OS

Grub, the default boot-loader for many Linux, has a command line tool grub-reboot, which allows to set the default boot-entry for ONLY next boot.

Along with reboot command, it allows to reboot directly into another entry. For example, reboot into the third menu try with command:

sudo grub-reboot 2 && reboot

NOTE: Grub menu entry counts from 0. Number 2 means the 3rd entry.

Preview Boot Menu without Reboot

You don’t have to reboot and count in the boot-menu for your desired number. There are 2 ways to preview the menu from in Ubuntu.

Option 1. Preview Grub Menu via Grub-Emu

Press Ctrl+Alt+T on keyboard to open terminal, and run command to install grub-emu:

sudo apt install grub-emu

Then, run grub-emu command in terminal will open up a window for previewing your boot-loader. And, close the terminal will also close the preview window.

The tool works good in Ubuntu 22.04, but NOT for Ubuntu 24.04 in my case somehow.

Option 2. Use Grub-Customizer

Grub-Customizer is a good alternative, as the preview tool does not work good in my case. To install it, open terminal (Ctrl+Alt+T) and run 3 commands below one by one.

The commands will add the software developer’s PPA repository, update cache and finally install it into your system.

sudo add-apt-repository ppa:danielrichter2007/grub-customizer

sudo apt update

sudo apt install grub-customizer

After that, search for and open it from either system start menu or ‘Activities’ overview depends on your DE.

As the screenshot shows you, number 2 is for Windows in my case. 1>1 means recovery mode, and 1>2 means the previous kernel entry.

So, run the command below will reboot directly into Windows in my case:

sudo grub-reboot 2 && reboot

To reboot into recovery mode in sub-menu entry (quotation marks required), use:

sudo grub-reboot "1>1" && reboot

And, if you want to use the command in script or bind with a keyboard shortcut, use command:

pkexec grub-reboot 2 && reboot

So, it will pop-up an authentication dialog asks you to type user password, before performing the action.

Method 2: Add Reboot option in top-right system menu

For GNOME 43/44, meaning users of Ubuntu 22.10, 23.04, Fedora 37/38, Arch and Manjaro Linux, there’s an extension to do the job by adding menu entries into system status menu.

By clicking on an entry in the menu, will pop-up password authentication dialog, and then shows you the reboot dialog. When typing correct password and click restart in pop-up dialog, it reboot directly with that entry you just clicked!

How to Install the Extension

For Ubuntu 22.10, first search for and install “Extension Manager” from Ubuntu Software.

Install Extension Manager in Ubuntu 22.04+

Then press Super (the Windows Logo) key to activate overview, search for and open “Extension Manager”. Finally, use the tool to install the “Custom Reboot” extension:

For Fedora 37/38 and other Linux with GNOME 43/44, you may go directly to the extension website and use ON/OFF switch to install it.

In Howtos grub

GIMP 2.99.14 Adds Apple Silicon Support, New ‘Gray’ Theme, Text Outline option

Last updated: November 19, 2022 — Leave a comment

GIMP image editor got a new update for its 2.99 development release this Friday. Here’s the new features as well as how to install guide for Ubuntu users.

GIMP 2.99.14 is the 7th development release for the next major 3.0 release. It reworked the Align and Distribute tool to make it easy to use. Target items to align or distribute are now the selected layers and/or paths. For layers in particular, a new option “Use extents of layer contents” is available to align or distribute target layers based on their pixel contents.

The Text tool now has new “outline” and “fill” options, to insert text in different styles. For me, it’s no longer required to use ‘Grow…’ and then ‘Stroke Selection’ to do similar job.

This release also introduced a new ‘Gray‘ theme, as well as “Override icon sizes set by the theme” option to resize icons among small, medium, large and huge.

XCF file support is greatly improved with multi-threading support. Saving with default RLE and zlib is now much faster! And, this release introduced initial Apple Silicon package support for macOS users.

Other changes in GIMP 2.99.14 include:

Transform tools activated automatically
New “Paste as Single Layer” and “Paste as Single Layer in Place” options in the Edit > Paste as submenu.
Moving to GApplication and GtkApplication
Add ‘Root layers only’ option on PDF export.
export PSD images as CMYK(A) support.
Metadata import and export for JPEG-XL support.
Initial support for Apple’s ICNS files.
Add “Show reduced images” option when importing TIFF.

How to Install GIMP 2.99.14:

The image editor has an official download page for the development releases. It offers the official package for Linux as Flatpak, though there’s also an unofficial PPA for Ubuntu users.

Option 1: Install GIMP 2.99.14 as Flatpak

Ubuntu and most other Linux can install the editor as Flatpak that runs in sandbox. For Ubuntu users, they are generally 3 commands for installing it:

Press Ctrl+Alt+T on keyboard to open terminal. Run command to install the daemon package in case you don’t have it.
```
sudo apt install flatpak
```
Then, add the flathub beta repository by running command:flatpak remote-add –user flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo

Finally, install GIMP beta release via command:

flatpak install --user flathub-beta org.gimp.GIMP

If you already installed the previous GIMP 2.99.12, use flatpak update --user org.gimp.GIMP beta command to update it.

And, if you also have GIMP 2.10 stable release installed as Flatpak, only one of them can be visible in system app launcher. Use either command below to switch between them:

flatpak make-current --user org.gimp.GIMP beta

flatpak make-current --user org.gimp.GIMP stable

NOTE: skip --user flag if you installed the package system wide without this parameter.

Option 2: install GIMP 2.99.14 from PPA

For those who prefer the classic .deb package format, there’s an unofficial PPA contains the package for Ubuntu 20.04, Ubuntu 22.04, and Ubuntu 22.10.

Simply, open terminal from start menu or by pressing Ctrl+Alt+T on keyboard, then run the commands below one by one to add the PPA, update, and install GIMP 2.99.x:

sudo add-apt-repository ppa:mati75/gimp30

sudo apt update

sudo apt install gimp

NOTE: If you have GIMP 2.10 stable installed as .deb package, the commands above will upgrade it to the latest development release.

To restore the stock GIMP package in system repository, run command to purge the Ubuntu PPA which also downgrade all installed packages:

sudo apt install ppa-purge & sudo ppa-purge ppa:mati75/gimp30

In Howtos image editor

Circular Desktop Widget for CPU/RAM Usage in Ubuntu 22.10/Fedora 37

Last updated: May 7, 2024 — Leave a comment

UPDATE: This Extension has NOT been updated for almost 1 year! Support ends at GNOME 43. Meaning you can still try it in Debian 12 GNOME.

Want to display digital clock, system memory and CPU load in your Desktop? There’s new circular widget for Ubuntu 22.10, Fedora 37, and other Linux with GNOME 43.

There are quite a few tools to display system load widget in desktop. Here I’m going to introduce the one that has a Conky look alike circular widget for GNOME desktop.

It displays local time, RAM usage and CPU load in 3 separated circular widget. Meaning you can drag moving any one of them to anywhere in your screen. And, it allows to resize the circle, change its color, line width, as well as text color and background, etc to get different look and feel.

Cool, isn’t it? Let me show you how to install it.

Step 1: Install Extension Manager

First, search for and install the “Extension Manager” app from Ubuntu Software, for installing Gnome extensions.

Install Extension Manager in Ubuntu 22.04+

Once installed, search for and launch the tool from ‘Activities’ overview screen.

Step 2: Install the Circular Widgets via Extension Manager

When Extension Manager opens, navigate to ‘Browse’ tab, then search for and install the Circular Widgets extension.

For Fedora 37 user, simply go to this web page and use ON/OFF switch to install it.

Step 3: Configure the widget

After installed the extension, go back to ‘Installed‘ tab in Extension Manager, or install and open ‘Gnome Extensions’ app from GNOME Software for Fedora. There you can open the configuration dialog for each circle widget.

NOTE: For Ubuntu & other Linux using “Desktop Icons NG (DING)” extension, you have to disable it temporarily until being able to drag moving the system load widget.

In Howtos Gnome

Show Clock in Top-bar for different Locations in Ubuntu 24.04 | 22.04

Last updated: May 5, 2024 — 1 Comment

This simple tutorial shows how to add world clock in top panel, so you can have a glance at what time is it now for different countries and locations.

Say you have business world-wide or family members or good friends live in different countries, a world clock can be quite useful to know the time in their locations.

If you’re working on Ubuntu, Fedora Workstation, or other Linux with GNOME desktop, then there’s an extension to display the time for your specified locations in top panel to make life easier.

As you see in the screenshot above, it also shows the sunrise and sunset time for the selected location.

Step 1: Install GNOME Clock

The extension uses GNOME Clock for the date and time information. You need to first install it either from Ubuntu Software (or App Center for 24.04):

Install GNOME Clock

Pay attention that you need to install the package in native .deb format, meaning from ‘ubuntu-xxx-universe’. Check the source drop-down box in header bar of Ubuntu Software. Or, press Ctrl+Alt+T to open terminal and run command to install it:

sudo apt install gnome-clocks

Step 2: Add different locations

After installing the app, press Super (Windows logo) key, then search for and open it from ‘Activities’ overview screen.

When it opens, click on the top-left corner ‘+’ button to add locations for your business partners or family members.

Step 3: Install Extension to make World Clock display on Panel

For Ubuntu 22.04 & Ubuntu 24.04, do the steps below one by one to install the extension:

Search for and install ‘Extension Manager’ from Ubuntu Software or App Center.
Click top-left edge ‘Activities’ to open overview, then search for and launch ‘Extension Manager’.
Finally, use the tool to search and install ‘Panel World Clock (Lite)’ extension under ‘Browse’ tab.

For Ubuntu 18.04 and Ubuntu 20.04, use web browser instead to install it:

First, press Ctrl+Alt+T on keyboard to open a terminal windows. When it opens, run command to install the agent package and manager app:
```
sudo apt install chrome-gnome-shell gnome-shell-extension-manager
```
Next, go to the extension web page by clicking the link button below:

Panel World Clock (Lite)
Click install browser extension if prompted via the link in that page. Finally, refresh and use the ON/OFF switch to install it.

After installing the extension, it should display world clock in top panel alongside local date and time. If not, try log out and back in to reload it.

In case you don’t like the default display location, you can open the configuration page in either Extension Manager or Gnome Extensions app. Then configure to:

show world clock in center or right.
Set number of clocks.
Show/hide local clock.
Display city/country name.

In Howtos clock

Steam now easy to install in Ubuntu via SNAP package

Last updated: November 16, 2022 — 1 Comment

Canonical, the company behind Ubuntu, is building the popular Steam game platform as Snap package!

The Ubuntu developer team is going to improve gaming experience on this popular Linux distribution. The first step is to simplify the process of setting up gaming environment. As the number 1 game platform, Steam to be first one they focus on.

Meaning Ubuntu 20.04, Ubuntu 22.04, and Ubuntu 22.10 can easily search for and install Steam as snap package from Ubuntu Software:

Steam in Ubuntu Software as Snap package

Or, user can press Ctrl+Alt+T on keyboard to open terminal and run the single command to get it:

snap install steam --beta

The command also work in Ubuntu 18.04, though --beta flag is required at the moment, because the package so far is in earlier stage for testing purpose.

After installed the package, just search for and launch it from ‘Activities’ overview screen:

It automatically install updates and setup runtime, and finally launch the client app for you.

Other Choices

As some users do not like Snap package, there are a few other ways to install Steam app in Ubuntu.

Option 1: Steam Installer

By searching in Ubuntu Software, you’ll see a “Steam Installer” package. Which is an empty package that automatically download steam package from its server and set it up in Ubuntu.

Steam Installer in Ubuntu Software

The package however is a 32-bit package which will also install a list of 32-bit libraries as dependencies.

Option 2: Steam’s official .deb package

Steam website offers official .deb package available for Debian/Ubuntu based systems.

Download Steam

User can download and then double-click on the package in file manager to install it.

Option 3: Flatpak package

The game platform is also available as the universal Flatpak package that runs in sandbox.

Just for choice, you may first run command in terminal (Ctrl+Alt+T) to install the Flatpak daemon:

sudo apt install flatpak

Then, install steam as flatpak package by running command:

flatpak install https://dl.flathub.org/repo/appstream/com.valvesoftware.Steam.flatpakref

Summary:

Ubuntu starts working on its official Steam package as Snap. Meaning user can now directly search for and install the game platform from Ubuntu Software. Besides that, there are also an installer script in Ubuntu Software, official .deb package from steam website, and Flatpak package available for choices.

In Howtos game