From log:
Setting up grub-common (1.99~rc1-13ubuntu3) ...
Installing new version of config file /etc/grub.d/00_header ...
Installing new version of config file /etc/grub.d/30_os-prober ...
Installing new version of config file /etc/grub.d/20_linux_xen ...
Installing new version of config file
** Attachment removed: VarLogDistupgradeAptclonesystemstatetargz.gz
https://bugs.launchpad.net/bugs/769656/+attachment/2085241/+files/VarLogDistupgradeAptclonesystemstatetargz.gz
** Attachment removed: VarLogDistupgradeSystemstatetargz.gz
** Tags added: dist-upgrade
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https://bugs.launchpad.net/bugs/769656
Title:
package grub-pc 1.99~rc1-13ubuntu3 failed to install/upgrade:
ErrorMessage: subprocess installed
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/769656
Title:
package grub-pc 1.99~rc1-13ubuntu3 failed to install/upgrade:
ErrorMessage: subprocess installed post-installation script returned