I have this line in the output of df -h
:
udev 16G 4.0K 16G 1% /dev
What is this thing doing? Do I need it, and if not, how can I reduce the size of it?
As far as I know, this never existed at least in Lucid.
Udev handles devices in the new Ubuntu and it very much needed, check out this link for information on it's use: http://manpages.ubuntu.com/manpages/karmic/en/man7/udev.7.html