How to debug XWin starting only sometimes? (Typo removed)

[Леон Майер]

> The bad news is that neither .xsession-errors nor a log in /var/log/xwin/ are produced in /var/log/xwin on an *unsuccessful* attempt.
The bad news is that neither .xsession-errors in the home directory nor a log in /var/log/xwin/ are produced on an *unsuccessful* attempt.

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