Recently upgraded my laptop from Ubuntu 16.04 to 18.04. Relatively few issues with the upgrade. However, after several days my laptop ran out of space. The “/” root partition (assigned 40GB) filled up completely.
I suspected some sort of a logging issue. The “du” command is excellent for checking disk usage, and I used the following to determine the offending file(s):
$ sudo du -hs *
Although expecting the offending file to be under /var/log/, I quickly zoned in on /var/lib/.
The offending file was:
Quick google yielded this:
The fix was pretty simple,
$ sudo apt-get remove xserver-xorg-input-synaptics
From the link:
I got the root cause of the issue now. It seems that Xorg replaces input-synaptics with libinput. The Ubuntu upgrader did not remove xserver-xorg-input-synaptics package after upgrade and confuses xorg package, so that the error message keeps added to the log.
A reboot then cleared the problem!