If you want to find the big files and clean up on your disk you might want to try this disk usage utility: qdirstat
Biggest directories from the terminal
The terminal version of QDirStat, K4DirStat or WinDirStat:
find . -type d -print0 | xargs -0 du | sort -n | tail -10 | cut -f2 | xargs -I{} du -sh {} (source)
Or install ncdu.