This is because one-grub update was published in xenial, but not in
bionic.
Thus upgrading from xenial-proposed to bionic-updates introduces
regression.
To mitigate this issue you can temporarily eanble bionic-proposed and
install all packages from there.
This is due to breakage introduced in xenial-update at the end of april.
** Changed in: shim-signed (Ubuntu)
Assignee: (unassigned) => Steve Langasek (vorlon)
** Package changed: shim-signed (Ubuntu) => grub2 (Ubuntu)
** Changed in: grub2 (Ubuntu)
Assignee: Steve Langasek (vorlon) => (unassigned)
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https://bugs.launchpad.net/bugs/1926690
Title:
package shim-signed 1.37~18.04.8+15+1552672080.a4a1fbe-0ubuntu2 failed
to install/upgrade: installed shim-signed package post-installation
script subprocess returned error exit status 1
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