> The current host has fedora installed first so grub is
> maintained by it instead. Hence mounting /boot/efi doesn't
> seems necessary.
If you are running in a secureboot environment with standard Microsoft
keys in firmware, you will not be able to boot the Ubuntu kernel from
Fedora's GRUB; you need to use Ubuntu's shim and GRUB for this
(technically only Ubuntu's shim, but you need a GRUB to go with it and
it might as well be the Ubuntu GRUB). This is one reason why dual
booting on UEFI systems is typically handled in the UEFI menu itself
rather than in the GRUB menu.
If you don't want to use Ubuntu's grub, you /can/ uninstall the shim,
shim-signed, and grub-efi-amd64'*' packages, and then you don't need to
mount /boot/efi during upgrades.
In any case, it sounds like this was a local configuration error
(removing /boot/efi from /etc/fstab), so closing this bug report as
invalid. Thanks!
** Changed in: shim-signed (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1670222
Title:
(/boot/efi not mounted) package shim-signed
1.23+0.9+1474479173.6c180c6-0ubuntu1 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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