Ubuntu – How to disable low disk space notification

You're only using 35% of your root-partition, it's probably a bug that it tells you it's low on space (or it's set to 10 GiBs or something like that, since most less experienced users don't differ / from /home)

To answer the question, if you like to resize partitions, you should use gparted. I'm quite sure this is still available on the Ubuntu Live-CD (search for "gparted" or "partition editor") - if you can't find it on the Ubuntu CD, try downloading the GParted Live-CD.

It's entirely possible that some file is bloating and eating up your space. I am remembering an old X-org bug where text files would use all your available disk space for logging errors or whatever until you disabled it.

Try running this command in the terminal:

find / -size +1G -type f -exec du -Sh {} + | sort -rh | head -n 5

You'll probably get a lot of "permission denied" errors, but that should be fine. If a file is ballooning out of control, I would suspect the file will be somewhere in space where you do have permission. That command will return the size and location of the 5 largest files on your system.

If that command does not work due to your lack of space (I think it will), you may have better success doing something like:

find / -size +1G | grep -v find | less

Which should find any file on your computer that is larger than 1 gigabyte in size, filter out any errors, and present the results for your review. You can then investigate any unfamiliar files.

If there is a file growing uncontrollably, you should then be able to delete it or conduct additional research on what it is - it may be a bug or a log you can disable.