So, this only happens for me when I add a PPA that does not have a Release file. (In this instance, dolphin-emu.org's PPA). I tried on another PPA that also does not have a release file and can replicate the error as well.
Disabling that PPA resolves the issue for now. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1871490 Title: update-manager crashed with TypeError in update(): argument of type 'NoneType' is not iterable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1871490/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
