After the rescue via live USB stick one can halt updating of the grub packages till a proper fix is available. I've done it with "dselect" (hotkey "H").
*== Opt admin grub-pc amd64 i386 2.02-2ubunt 2.02-2ubunt *== Opt admin grub-pc-bin amd64 i386 2.02-2ubunt 2.02-2ubunt *== Opt admin grub2-common amd64 i386 2.02-2ubunt 2.02-2ubunt or you can it on the commandline: apt-mark hold grub2 apt-mark hold grub2-pc apt-mark hold grub-efi-amd64-signed and any other which are currently installed. /Bernd -- 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
