Tails Jessie displays "Oh no! Something had gone wrong" instead of the Greeter

A tails jessie build from bc874db on Sept 12, 2014 displays “Oh no! Something had gone wrong” instead of the greeter.

There is a line Fails to give slave programs access to the display. Trying to proceed. in gdm logs.

The same happens if I disable tails-greeter by choosing session-name=gdm-shell in /etc/gdm3/greeter.dconf-defaults and restart gdm.

Feature Branch: feature/jessie

Original created by @alant on 7890 (Redmine)

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