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In /var/log/xdm-error.log, the following error messages appear. stdin: is not a ttyusage: xsetroot [options] where options are: -display <display> or -d <display> -fg <color> or -foreground <color> -bg <color> or -background <color> -rv or -reverse -help [...] etc. xsetroot is obviously being called in a broken way by something
This appears to be due to a problem in the X startup scripts. It will be fixed sometime later. It does not appear to have any functional implication.
*** This bug has been marked as a duplicate of 2484 ***