Examining your DpkgTerminalLog.gz file I see the following:
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by
another process: Resource temporarily unavailable
User postinst hook script [/sbin/update-grub] exited with value 1
Seems you had something else running while performing the upgrade.
Closing this as it's not a kernel bug.
** Changed in: linux (Ubuntu)
Status: New => Invalid
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package linux-image-2.6.28-14-generic 2.6.28-14.46 failed to install/upgrade:
subprocess post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/402791
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