Installing
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2. Enabling Qt4 Repository
Add Qt4 PPA Repository for Xubuntu GNU/Linux
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3. Installing Qt4
Then to Install Qt4 in Xubuntu
Simply run:sudo apt install qt4-default
Authenticate with the User’s Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.
Next to make it fixed and so integrate it definitely into the System:sudo apt-mark manual qt4-default qt4-qmake qtcore4-l10n libllvm9 libmng2 libodbc1 libqt4-dbus libqt4-declarative libqt4-designer libqt4-dev libqt4-dev-bin libqt4-help libqt4-network libqt4-opengl libqt4-opengl-dev libqt4-qt3support libqt4-script libqt4-scripttools libqt4-sql libqt4-sql-odbc libqt4-svg libqt4-test libqt4-xml libqt4-xmlpatterns libqtdbus4 libqtgui4 qdbus qt4-linguist-tools
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4. Reinstalling Qt5
Now you have to Reinstall Qt5
This because the default Xubuntu setup suppose only one version is enough:sudo apt install qt5-default
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5. Testing Qt4
Finally, to Test Qt4 Setup
On Command Line play:qmake-qt4 -v
So Now I’m truly Happy if My Guide could Help you to Install Qt4 on Xubuntu 20.04 Focal!
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