Is it possible to revert to the old (12.04-13.xx) lock screen from the current Unity lock screen in Ubuntu? If so, how can I do it from the terminal? I have to script this change across 200+ computers, so a non-GUI method is highly preferred.

The new lock screen is buggy and a pain to use in multi-user environments:

  • The Unity lock screen isn't playing well with LDAP. Often it gives an invalid password error, and the user has to use Switch Accounts action (from the gear menu) to get to LightDM and then log in, which always works fine. A known bug, apparently.
  • I can't find any quick way to use the Switch Accounts action. In the LightDM version, there would be a Switch Accounts button which was only a couple of Tab presses away. If some user leaves his PC without logging off, everytime the screen locks, that user's lock screen is shown, forcing other users to use the Switch Accounts action from the gear menu (for which keyboard shortcuts are not readily apparent) to unlock their sessions.

A couple of iterations more, and the Unity lock screen might start working fine, but for now, any scriptable way to get back to the old way is highly appreciated. I am aware of the CCSM way, and it will be a last-resort action.

Let me stress: the bugs are irrelevant to me. Reporting and solving them can be done in good time, after I have got the old one back.

  • linuxg.net/… – Tim Aug 6 '14 at 13:34
  • @Tim I've seen that method, but how do I configure CCSM to use lightdm from the terminal? And I recall seeing a more recent post elsewhere which said that this method no longer worked. – muru Aug 6 '14 at 13:35
  • My mistake, sorry... Just checked. Can I ask why you need to do this? – Tim Aug 6 '14 at 13:43
  • @Tim I have updated the question. – muru Aug 6 '14 at 13:53

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