It was fixed by latest gir package: gir1.2-networkmanager-1.0
Just a matter of "apt-get dist-upgrade" it.
I will close it as solved.
** Changed in: network-manager (Ubuntu)
Status: Confirmed => Fix Released
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: network-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1540381
