A first shot: High traffic in an error log. I guess if you would download videos, you would know it. :)
sudo du -sh /var/log
- -s is summary
- -h is human readable (k, M, G, T) suffix
For me it is 20M, and beside the log-directory, there is a cache for the installations. Use
If this is your problem.
Of course, you should check /home if it is in your root partition.
If you have to search big files iteratively, I can suggest a series of commands, which can be repeated and is pretty fast after the first initial step:
- You start at a suspicious directory at top level
- Then you search all subdirs and files for their size, and sort numerically:
sudo du -s /var/* | sort -n
- I stripped the example, to keep it short. So we see, that the bigest subdir is /var/lib, and repeat the step for /var/lib. Now the search is much faster, because the computated results are somehow cached:
sudo du -s /var/lib/* | sort -n
and so on. Follow the biggest dirs to find the bigger files. You can't use -sh here, because sorting numerically does not work with the k/M/G/T for kilobyte and so on.