This is what happened...
I have a 30 GB ubuntu partition but i was getting warnings about less disk space remaining, when according to me i should have had 15gb space left. so i checked with disk utility, which did not help me. Then i installed xdiskusage, which showed those 15gb as permission denied. before i could begin to check for the source, everything crashed because my disk became full, and i am now not even able to login. can anyone tell me why is the 15-16 gb space showing up as permission denied, and how can i reclaim that space.
i couldnt take a snapshot, but found this one on the net which closely resembled my situation.
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