You may need to run the following from a terminal:
sudo apt-get install -f
sudo apt-get clean
sudo apt-get update
Then re-install the package or updates.
If that does not resolve your issue, please mark the bug as "Confirmed"
** Package changed: linux-signed (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1794866
Title:
package linux-image-4.15.0-34-generic 4.15.0-34.37 failed to
install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub
exited with return code 127
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