Comment 19 for bug 1183692

This affects the upgrade tool as well - if the user gets the prompt to do the update to 16.04 and clicks "upgrade", it downloads the update tool, starts to check and see if it can do the upgrade, and then fails with the same "not enough disk space" error.

It also doesn't offer an easy way to correct the issue and the continue running the upgrade, so the user is left with an error box that can only be closed and no easy way to re-start the update after fixing the problem (assuming they can figure out how to fix the problem).

The last few times I've seen this issue, it seems that apt-get autoremove actually correctly identifies the old installed kernel files and removes them properly (it was inconsistent before as to whether autoremove would work) - perhaps simply offering the user an option to 'clean up old system files' and then run autoremove would be sufficient?