I own a notebook (Asus L502N) eith Endless OS on it and I had problems with it before, but now this showed up and I have no idea what to do.
This is a shot in the dark - but it looks like your hard disk has crashed. Or developed bad sectors.
You can try reformatting it and have the formatting software mark out the bad sectors. But because you say that you have had trouble with it before, Iād say change the hard disk drive altogether.
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