You modified your /etc/default/grub file and put an extra quote here:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"i8042.kbdreset=1"
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1768605
Title:
package grub-pc 2.02~beta3-4ubuntu7.3 failed to install/upgrade:
subprocess installed post-instal
