Beta 1 testers
flocculant at gmx.co.uk
Wed Feb 22 07:39:47 UTC 2017
Please enable -proposed and update lightdm only. 
Then test the following:
1. Lock desktop - can you unlock without trying more than once?
2. Lock desktop, then login to guest session and logout, revert to
your normal user - can you unlock without trying more than once?
3. Suspend and restart - can you unlock without trying more than once?
I have managed to fail the 3rd option when I'm a bit quick entering the
password ... 
 You should find lightdm package 1.21.5-0ubuntu1 if not - try
changing repo server to Main.
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