Please run apport-collect to collect the data that is normally collected
when reporting a bug using ubuntu-bug.
update-grub does not update grub, so it's not surprising that nothing
changes (it updates the config file). Run sudo dpkg-reconfigure grub-
efi-amd64-signed and look at its output, or directly /usr/lib/grub/grub-
multi-install (or more directly grub-install). Perhaps something is
misconfigured?
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1918314
Title:
Cannot boot from grub after upgrade
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