This issue was resolved by cjwatson and vorlon addressing the mismatching versions between what's in the repos and what was being put on the ISO (caused by a desync in the local ftp mirror the builder was using).
This is not a Cala bug nor a Grub bug, this was an ISO builder issue. ** Changed in: calamares (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1917292 Title: Lubuntu Hirsute daily install failed due to grub packaging errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/calamares/+bug/1917292/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs