Something

root@fostral:/# dpkg --purge linux-image-2.6.15-27-k7; apt-get install linux-image-2.6.15-27-k7
dpkg: dependency problems prevent removal of linux-image-2.6.15-27-k7:
 linux-image-k7 depends on linux-image-2.6.15-27-k7.
 linux-restricted-modules-2.6.15-27-k7 depends on linux-image-2.6.15-27-k7.
dpkg: error processing linux-image-2.6.15-27-k7 (--purge):
 dependency problems - not removing
Errors were encountered while processing:
 linux-image-2.6.15-27-k7
Reading package lists... Done
Building dependency tree... Done
linux-image-2.6.15-27-k7 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.