I also have just run into this problem on an installation of Ubuntu
Lucid, owned by a non-technical user.

The machine had become unusable - many programs could not run, including
the package manager. Symptoms were totally baffling for the user:
although some errors appear claiming that there is not enough space, a
check of the filesystem capacity using GUI tools shows there is in fact
plenty of space.

Indeed, this foxed me for a while, as even when it was evident that the
limit was the number of inodes rather than storage space, there seems to
be no easy way to find what is using up inodes except by running shell
commands which count files, a slow and painful process, especially when
directing a user over the phone.

The issue: about 20 kernel package upgrades using up all the available
inodes on the root filesystem. Uninstalling these freed 55% of a total
of 650000 inodes.  Entirely simple, and with a bit of polish, could be
made totally avoidable with a suitable option.  There's no need to keep
so many kernel packages around.

Removing old kernels does require more effort than it would appear to
deserve (list the packages, grep, pipe into apt-get remove).  It would
make sense to me if the automatic updates manager could be told to
handle removing kernels too.

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https://bugs.launchpad.net/bugs/1089195

Title:
  linux-headers will eat your inodes on LTS.

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