Hi. Fresh additional information.
Googling around i've stumbled in  another bug which recalls this. Apparently 
lightdm is (occasionally) "killing himself". 
Browsing the lightdm.log file i've found this:
[+03.05] Got signal 15 from process [the PID of lightdm itself!]

So lightdm is apparently killing himself.

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https://bugs.launchpad.net/bugs/1061149

Title:
  boot occasionally hangs while "Checking battery state..."

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