I have the same issue for software-properties-gtk. Software-properties- qt does start, but doesn't show any software sources as enabled.
If I had to guess, I'd blame the fact that upgrading to 24.04 seems to have moved default repos from /etc/apt/sources.list to /etc/apt/sources.list.d/ubuntu.sources and changed the format to a more explicit one. Attached here is my /etc/apt/sources.list.d/ubuntu.sources ** Attachment added: "ubuntu.sources" https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/2053228/+attachment/5748930/+files/ubuntu.sources -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2053228 Title: software-properties-gtk does not start To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/2053228/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs