Unfortunately your bug report does not show any output from the
installation of the shim-signed package. But I notice that the contents
of your /boot/efi/efi/ubuntu directory are a bit unusual:
FSCK0000.000
fsck0000.001
FSCK0000.002
fsck0000.003
FSCK0000.004
FSCK0000.005
FSCK0000.006
FSCK0000.007
fsck0000.008
fw
fwupx64.efi
grub.cfg
grubx64.efi
MokManager.efi
Perhaps the installation failed because of corruption on your EFI system
partition?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1652514
Title:
package shim-signed 1.21.3+0.9+1465500757.14a5905.is.0.8-0ubuntu3
failed to install/upgrade: subprocess installed post-installation
script returned error exit status 1
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