Comment 2 for bug 390377

Examining your DpkgTerminalLog.txt file this seems to be a duplicate of bug 269539 so I am marking it as such. Please continue to track this issue at that report.

From your DpkgTerminalLog.txt file:

Merging changes into the new version

 Conflicts found! Please edit `/var/run/grub/menu.lst' and sort them out manually.
 The file `/var/run/grub/menu.lst.ucf-new' has a record of the failed merge of the configuration file.

User postinst hook script [/sbin/update-grub] exited with value 3
dpkg: Fehler beim Bearbeiten von linux-image-2.6.28-13-generic (--configure):
 Unterprozess post-installation script gab den Fehlerwert 3 zurück