Apt dpkg postinst debug

LANG=C apt-get -f install Err 100
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
linux-headers-3.2.0-31-generic linux-headers-3.2.0-31 linux-headers-3.2.0-27 libclamav6 linux-headers-3.2.0-27-generic libtommath0
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up grub-pc (1.99-21ubuntu3.20) ...
Killed
dpkg: error processing grub-pc (--configure):
subprocess installed post-installation script returned error exit status 137
Errors were encountered while processing:
grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)

/var/lib/dpkg/info/grub-pc.postinst
/var/lib/dpkg/info/grub-pc.postrm
/var/lib/dpkg/info/grub-pc-bin.md5sums
/var/lib/dpkg/info/grub-pc-bin.list
/var/lib/dpkg/info/grub-pc.prerm
/var/lib/dpkg/info/grub-pc.config
/var/lib/dpkg/info/grub-pc.templates
/var/lib/dpkg/info/grub-pc.conffiles
/var/lib/dpkg/info/grub-pc.preinst
/var/lib/dpkg/info/grub-pc.md5sums
/var/lib/dpkg/info/grub-pc.list

#!/bin/bash -x