Preparing to unpack .../firefox_65.0.1+build2-0ubuntu0.18.10.1_amd64.deb ...
Unpacking firefox (65.0.1+build2-0ubuntu0.18.10.1) over (65.0+build2-0ubuntu0.18.10.1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for desktop-file-utils (0.23-3ubuntu3) ...
Setting up grub-pc (2.02+dfsg1-5ubuntu8.2) ...
dpkg: error processing package grub-pc (--configure):
 installed grub-pc package post-installation script subprocess returned error exit status 10