Comment 3 for bug 1969353

Upon further inspection of the log, I realised that the issue occurs when /etc/grub.d/bin/grubcfg_proxy is being run but this file is not part of grub itself. Looking through the package contents, it looks like grubcfg-cfg is included in grub-customizer which is installed on my system so, this is perhaps actually and issue with the grub-customizer package?

It looks like it is not the first time this package has this kind of compatibility issues: https://askubuntu.com/questions/1168054/how-to-fix-kernel-issue-after-upgrading-from-18-10-to-19-04