In a workstation with Ubuntu 18.04 using EUFI, new entries (related to devuan and Debian) were inserted before the Ubuntu entry. The workstation does not have those OSes so I am not sure why they did showed. I am assuming they were inserted by the faulty grub2 update.
Anyway, I edited (using the BIOS) those entries so Ubuntu boot is listed first and it fixed the problem in the workstation. Now it boots normally. I updated packages and still is booting. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1889509 Title: grub boot error : "symbol 'grub_calloc' not found To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1889509/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
