I found having a folder called
/debian in the root folder (
/) which is 2.5GB of size. It contains a single subfolder called
dbgtmp that contains several other subfolders.
I'm almost sure that they're the remains of my custom kernel compiled because of the missing touchpad driver from 14.04 stock kernel.
$ uname -a Linux asus-UX303LA 3.17.2-custom #2 SMP Wed Nov 5 08:59:54 AEDT 2014 x86_64 x86_64 x86_64 GNU/Linux
My question is whether is it to safe to delete that folder or not?