While the addition of PPAs are supported by Ubuntu, PPAs themselves are not supported by Ubuntu. It seems as though the PPA you are trying to add got removed. Please contact the owner of the PPA at https://launchpad.net/~rock-core
** Changed in: software-properties (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to software-properties in Ubuntu. https://bugs.launchpad.net/bugs/2039289 Title: add-apt-repository ppa:rock-core/qt4 fails Status in software-properties package in Ubuntu: Invalid Bug description: 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux DISTRIB_ID=Ubuntu DISTRIB_RELEASE=20.04 DISTRIB_CODENAME=focal DISTRIB_DESCRIPTION="Ubuntu-Server 20.04.3 LTS amd64 sudo add-apt-repository ppa:rock-core/qt4 Cannot add PPA: 'ppa:~rock-core/ubuntu/qt4'. The team named '~rock-core' has no PPA named 'ubuntu/qt4' Please choose from the following available PPAs: * 'qt4': Qt4 for Ubuntu 20.04 This used to work until sometime on Monday. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/2039289/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp