I can confirm that this bug is not fixed. Today Ubuntu informed me of 20.04 and I started the distribution upgrade. I got the following message:
"Could not install 'grub-pc'. The upgrade will continue but the 'grub- pc' package may not be in a working state. Please consider a bug report about it. Installed grub-pc package post-installation script subprocess returned error exit status 1." I can reboot normally and so far I can tell everything is working. When I do a # apt autoremove I get the following error: Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 2 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up grub-pc (2.04-1ubuntu26.4) ... dpkg: error processing package grub-pc (--configure): installed grub-pc package post-installation script subprocess returned error exit status 1 dpkg: dependency problems prevent configuration of linux-crashdump: linux-crashdump depends on grub-pc (>= 1.96+20090611-1ubuntu2) | grub-efi-ia32 | grub-efi-amd64 | grub (>= 0.97-29ubuntu24); however: Package grub-pc is not configured yet. Package grub-efi-ia32 is not installed. Package grub-efi-amd64 is not installed. Package grub is not installed. dpkg: error processing package linux-crashdump (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup erro r from a previous failure. Errors were encountered while processing: grub-pc linux-crashdump E: Sub-process /usr/bin/dpkg returned an error code (1) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1891680 Title: grub-pc needs to detect when debconf points to invalid drive and stop in preinst, before unpacking files, and also treat this as a failure in postinst To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1891680/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs