*** This bug is a duplicate of bug 1889556 *** https://bugs.launchpad.net/bugs/1889556
This bug bit me pretty hard: My Ubuntu 20.04 laptop updated via unattended-upgrades. Then it lost power due to last week's derecho. Now the OS won't boot. Anyway, FWIW, I think OP's # dpkg-reconfigure grub-pc advice applies to MBR installations only. If you have a modern EFI installation I think you need dpkg-reconfigure grub-efi-amd64 instead. -- 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