{"id":43362,"date":"2022-11-24T06:06:25","date_gmt":"2022-11-24T06:06:25","guid":{"rendered":"https:\/\/ubuntuhandbook.org\/?p=43362"},"modified":"2024-05-04T12:55:47","modified_gmt":"2024-05-04T12:55:47","slug":"dual-boot-os-disappear-after-ubuntu-22-10","status":"publish","type":"post","link":"https:\/\/ubuntuhandbook.org\/index.php\/2022\/11\/dual-boot-os-disappear-after-ubuntu-22-10\/","title":{"rendered":"[Quick Fix] Dual-boot OS disappeared after installing Ubuntu 24.04 Updated"},"content":{"rendered":"

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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.<\/p>\n

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

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 \u2018false\u2019 to enable this feature in the grub-mkconfig command.<\/i><\/p><\/blockquote>\n

By reloading the config will prompt your that “Warning: os-prober will not be executed to detect other bootable pertitions<\/i>“.<\/p>\n

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Ubuntu 22.04<\/b> 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.<\/p>\n

Option 1: Manually re-enable OS-PROBER<\/h3>\n

As mentioned in the manual, just set the ‘GRUB_DISABLE_OS_PROBER’ option to ‘false’ in Grub configuration will do the trick.<\/p>\n

1. First, press Ctrl+Alt+T<\/b> on keyboard to open a terminal window. When it opens, run command to edit the Grub config file:<\/p>\n

sudo nano \/etc\/default\/grub<\/pre>\n
Ubuntu 22.10 and higher switched to gnome-text-editor which however does not work along-with sudo<\/code> from command line.<\/del> So here I use nano<\/code> command line text editor instead.<\/i><\/p>\n
2. When the file opens in terminal window, scroll down and add the new line (or change the value if the line already exists<\/em>):<\/p>\n
GRUB_DISABLE_OS_PROBER=false<\/b><\/p>\n
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After that, save changes by pressing Ctrl+X<\/b>, type y<\/b> and hit Enter.<\/p>\n
3. Finally, run sudo update-grub<\/code> to reload the change.<\/p>\n
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Don’t know why, but Windows OS appears in boot-menu again after I did restart computer twice in my case.<\/p>\n
Option 2: Use Grub-Customizer (graphical tool)<\/h3>\n
For those who prefer using a graphical configuration tool, there’s a third-party Grub-Customizer app available for choice.<\/p>\n
1. First, you still need to open terminal (Ctrl+Alt+T<\/b>) and run 3 commands one by one to install the tool from developer’s PPA<\/a>:<\/p>\n
sudo add-apt-repository ppa:danielrichter2007\/grub-customizer<\/pre>\n
sudo apt update<\/pre>\n
sudo apt install grub-customizer<\/pre>\n
2. Search for and launch grub customizer from system start menu or ‘Activities’ overview.<\/p>\n
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3. When the app opens, navigate to ‘General Settings<\/b>‘ page, then do:<\/p>\n