Just found a handy command:

[Timmer1240]

To remove all the unused Linux Kernel headers, images and modules, simply run this command: dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge

[CharlesA]

Nice one. That's a bit easier then the way I was doing it.

[Timmer1240]

Lot of useful things here! http://www.webupd8.org/

[cariboo]

If you are running Natty, and are a synaptic user, it marks older kernels as obsolete the next time you run it after installing a new kernel and rebooting.

[CharlesA]

If you are running Natty, and are a synaptic user, it marks older kernels as obsolete the next time you run it after installing a new kernel and rebooting.

Does that affect the way dpkg sees them?

Just curious, as I haven't checked out Natty yet.

[Timmer1240]

I just might have to upgrade someday I guess Im still using and loving Karmic 9.10 but support is going to end soon. Im not sure if I like the new unity desktop I just love gnome and how easy and intuitive it is but will upgrade sooner or later maybe in April.

[wojox]

All but the current and second most run from the command line:

OLD=$(ls -tr /boot/vmlinuz-* | head -n -2 | cut -d- -f2- | \
    awk '"'"'{print "linux-image-" $0}'"'"' )
if [ -n "$OLD" ]; then
    apt-get -qy remove --purge $OLD
fi
apt-get -qy autoremove --purge

[ki4jgt]

Awesome. I just lost 395 megs

[theraje]

That is handy! In fact, I think I'll commit it to memory.

...

As if.

[earthpigg]

dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge

is there a website that explains all the s/\(.*\)-\( stuff?

i see it a lot and it is clearly powerful, flexible, and robust as hell, but i don't even know what it is called, so have no idea how to google it.