I confirm what Antoine said. Try to run either:
sudo apt-get install gdm
or
sudo dpkg-reconfigure lightdm
(if you've already installed gdm but left lightdm as the default login
manager)
and select gdm as the default login manager. The issue is gone. This is
related to the lockscreen used by lightdm which is different from the
one used by gdm. Infact the function which causes the problem is called
"lock". This is the body:
/* Fallback code to handle session locking using gnome-screensaver,
in case the required GDM dependency is not there
*/
[... some code ...]
lock: function() {
this._proxy.call('Lock', null, Gio.DBusCallFlags.NONE, -1, null,
Lang.bind(this, function(proxy, result) {
proxy.call_finish(result); <------ the cause is
this call
this.emit('lock-screen-shown');
}));
},
[... some more code ...]
The problem is that neither gnome-screensaver nor gdm are installed so none of
the above mentioned "dependencies" is satisfied (my might-be-wrong personal
opinion). I didn't try installing gnome-screensaver instead of gdm though, it
could work too.
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https://bugs.launchpad.net/bugs/1057960
Title:
Suspend does not work in Gnome-Shell
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