Could you please provide the output of the following command :
sudo DEBCONF_DEBUG=developer sh -x /usr/sbin/update-grub ; echo $?
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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package linux-generic failed to install/upgrade: User postinst hook script
[/sbin/update-grub] exited with value 10
https://bugs.launchpad.net/bugs/297167
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