Could you please run this command and paste the output?
sudo DEBCONF_DEBUG=developer bash -ex /var/lib/dpkg/info/grub-
pc.postinst configure 1.96+20090725-1ubuntu2
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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package grub-pc 1.96+20090826-3ubuntu3 failed to install/upgrade: el subproceso
script post-installation instalado devolvió el código de salida de error 1
https://bugs.launchpad.net/bugs/420203
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