This appears to be a bug unrelated to the ones we currently know about,
but unfortunately the logs attached to the report don't give a complete
picture. DpkgHistoryLog shows:
Start-Date: 2017-06-07 10:36:19
Commandline: apt-get --no-upgrade -o
Acquire::gpgv::Options::=--ignore-time-conflict -y install grub-efi-amd64-signed
Install: grub-efi-amd64-bin:amd64 (2.02~beta3-4ubuntu2, automatic),
grub-efi-amd64:amd64 (2.02~beta3-4ubuntu2, automatic),
grub-efi-amd64-signed:amd64 (1.80+2.02~beta3-4ubuntu2)
Error: Sub-process /usr/bin/dpkg returned an error code (1)
End-Date: 2017-06-07 10:36:26
DpkgTerminalLog shows:
Log started: 2017-06-07 10:36:19
Log ended: 2017-06-07 10:36:26
So dpkg has reported an error but there is no output from the grub
packages to suggest why.
And your /boot/efi directory appears to be fully populated.
If you run 'sudo dpkg --configure -a' from a terminal, does this do
anything?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1696342
Title:
package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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