Gnome is hiding - looping.

[Ralf Mardorf]

On Mon, 11 Sep 2017 19:05:34 +0200, Petter Adsen wrote:
>Try logging in on the console like Colin described and look for errors
>in ~/.xsession-errors, there might be clues as to what is failing
>there.

Perhaps, but more likely the display manager's and its greeter's log
files and perhaps the current xorg log file provides the pointer to the
issue.

A starting point would be

  grep EE /var/log/Xorg.0.log

and for e.g. lightdm

  less /var/log/lightdm/lightdm.log
  less /var/log/lightdm/seat0-greeter.log
  less /var/log/lightdm/x-0-greeter.log
  less /var/log/lightdm/x-0.log

Warning!

The OP followed advices and/or run a script from an unknown source.
Just fixing the obviously issue might not fix something very evil under
the hood.

Apart from this concern, knowing what the OP actually run, is the best
step to troubleshoot the issue, even if there shouldn't be something
evil under the hood.

Regards,
Ralf