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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 .
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