Comment 38 for bug 798414

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T Gates (tgates-t) wrote : Re: update-initramfs should produce a more helpful error when there isn't enough free space

Don't delete them all just a few of the oldest ones. It will only free space for your /boot ..
df- H will show /boot free space. Once you free up some room on the /boot you can run "sudo apt-get autoremove"