Please read the output, your kernels are not signed with keys known to
your firmware and hence the update has been aborted to you keep your
system hopefully bootable.
** Changed in: grub2-signed (Ubuntu)
Status: Confirmed => Invalid
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: grub2-signed (Ubuntu)
Status: New => Confirmed
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2044974
