How to Install Qt4 Libraries in Ubuntu 20.04 LTS

Last updated: November 25, 2020 — 9 Comments

The Qt4 framework has been removed from Ubuntu 20.04 main repository. It is however still required for some obsolete applications.

Though it is not recommended, you can still get Qt4 libraries (e.g., libqt4-declarative, qt4-dev-tools, qt4-qmake, libqtwebkit4, and more) as software dependencies or for building an application via this third-party PPA.

1.) Open terminal either by pressing Ctrl+Alt+T on keyboard or by searching for ‘terminal’ from your system application launcher. When terminal opens, run command:

sudo add-apt-repository ppa:rock-core/qt4

Type user password (no asterisk feedback) when it prompts and hit enter.

For Ubuntu 20.10 users sticking to Qt4 libraries, try well trusted UNetbootin PPA.

The PPA built Qt4 package as dependency libraries since Unetbootin was based on Qt4.

sudo add-apt-repository ppa:gezakovacs/ppa

2.) After adding the PPA, it should automatically refresh the system package cache. On some Ubuntu derivatives, you may run command to manually update the package cache:

sudo apt update

3.) Finally install the software .deb package, and it should automatically install the required Qt4 libraries after running sudo apt -f install.

Or you may install specified Qt4 package by running command:

sudo apt install PACKAGE_NAME

See here for a full list of available Qt4 libraries.

Uninstall Qt4:

To remove the PPA, run command:

sudo add-apt-repository --remove ppa:rock-core/qt4

To remove all Qt4 libraries, run command:

sudo apt remove --autoremove libqt4* libqtcore4 libqtgui4 libqtwebkit4 qt4*


I'm a freelance blogger who started using Ubuntu in 2007 and wishes to share my experiences and some useful tips with Ubuntu beginners and lovers. Please notify me if you find any typo/grammar/language mistakes. English is not my native language. Contact me via [email protected]

9 responses to How to Install Qt4 Libraries in Ubuntu 20.04 LTS

  1. The remove PPA command should be:
    sudo add-apt-repository ppa:rock-core/qt4 --remove

  2. Awesome !

  3. et pour 20.10?

  4. Thank you. I have an old binary that needs libqt4core and libqt4gui — you got them for me.

  5. sudo apt install PACKAGE_NAME ??? what package
    this is manual how to install python-qt4 i still get

    apt-get install python-qt4Reading package lists… Done
    Building dependency tree
    Reading state information… Done
    E: Unable to locate package python-qt4

  6. This is so helpful thank you so much!

  7. Debian PACKAGES for qt4 can also be downloaded from

  8. This used to be really hard. I wish I had found this page 5 years ago. Thanks.

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