I can give another example (and not the first one I've seen). The group is qbittorrent, but apt, libudev1, apt-utils, libapt-pkg6.0, libsystemd0 all aren't related at all. qbittorrent comes from a PPA (http://ppa.launchpad.net/qbittorrent-team/qbittorrent-stable/ubuntu). There are non-grouped libudev1:i386, libsystemd0:i386 and I had the impression before that the occurrence of both a native and a i386 package may be involved in the mis-grouping.
** Attachment added: "Screenshot from 2021-04-12 11-48-08.png" https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1214218/+attachment/5486830/+files/Screenshot%20from%202021-04-12%2011-48-08.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1214218 Title: Package shown inside wrong group in tree view To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1214218/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs