What solved the issue for me has been:

1. Purge policykit (please note that this will remove ubuntu-desktop as well) 
from Synaptics
2. As Ubuntu-desktop has been removed I had to manually reconnect to the LAN 
(the network manager applet has been removed as well) 
3. Reinstall ubuntu-desktop
4. Reboot the machine

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Unlock button throws an error, doesn't authenticate
https://bugs.launchpad.net/bugs/187335
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Desktop Bugs, which is a bug assignee.

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