Code:
cd /var/cache/apt/archives
ls -la
You should see the latest kernel version is probably not 2.6.30.5. Maybe it is. If isn't there, you can't expect bash to understand invalid syntax.
At the empty prompt,
Code:
dpkg -i --force-all linux-image-2.6
then hit tab, enter another letter, wash, rinse, repeat until you get the version you want.
if you must use 30.5, try trac.offensive-security.com/repository/browser/backtrack/macroverse/l/linux/linux-image-2.6.30.5_2.6.30.5-10.00.Custom_i386.deb?rev=1