How to clear the /opt usage. /opt : 76% used
Internal filesystems:/ : 21% used ( 2924316 of 14987616)/dev : 0% used ( 0 of 32892028)/dev/shm : 0% used ( 0 of 32903380)/run : 1% used ( 1228 of 32903380)/sys/fs/cgroup : 0% used ( 0 of 32903380)/boot ...