I had the same problem, after the upgrade from 18.04 to 20.04.1 it it opens correctly. Then I removed some useless repositories and when updating the list the software hung and I had to force its closing. After that it opens only with root permissions (sudo software-properties-gtk).
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1868501 Title: software-properties-gtk is blank when run as normal user. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1868501/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
