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What is xsession-errors?

So I was looking into why a program was getting rid of my background, and the author of the program said to post .xsession-errors and many people did. Then my next question was: What is .xsession-errors? A google search reveals many results but nothing explaining what it is.

What I know so far:

  • It's some kind of error log. I can't figure out what it's related too (ubuntu itself? programs?)
  • I have one and it seems like all Ubuntu systems have it, though I cannot verify.
Solution

  • It's the error log produced by your X windows system (which the Ubuntu GUI is built on top of).

    Basically it's quite a low level error log for X11.