issue purging linux-ubuntu-modules-2.6.22-12-generic :(

i was running gutsy during the beta phase.
i recently noticed that linux-ubuntu-modules-2.6.22-12-generic had been removed but not purged, so i went to purge it and synaptic spat out an error.
i then attempted to do it manually with sudo dpkg --purge linux-ubuntu-modules-2.6.22-12-generic
but this failed with

(Reading database ... 137222 files and directories currently installed.)
Removing linux-ubuntu-modules-2.6.22-12-generic ...
Purging configuration files for linux-ubuntu-modules-2.6.22-12-generic ...
FATAL: Could not open '/boot/System.map-2.6.22-12-generic': No such file or directory
update-initramfs: Generating /boot/initrd.img-2.6.22-12-generic
Cannot find /lib/modules/2.6.22-12-generic
update-initramfs: failed for /boot/initrd.img-2.6.22-12-generic
dpkg: error processing linux-ubuntu-modules-2.6.22-12-generic (--purge):
 subprocess post-removal script returned error exit status 1
Errors were encountered while processing:
 linux-ubuntu-modules-2.6.22-12-generic

i'm not sure what type of other debugging information is required, but feel free to ask =D