Hello fellows!
I have almost the same problem: after updating oxideqt and its libraries I lost 
my NetworkManager. I had to update oxideqt with Synaptic because both Ubuntu 
Software Updater and apt-get refused to do it. After update everything was 
continuing without any trouble. Untill I have rebooted my PC. After rebooting 
NM-applet starts in background: without any sign in tray and without any 
connection to the net. Same scene on both my computers: PC and notebook on the 
same day!
System: Ubuntu 14.04.3 (PC - updated from 14.04.2, NB - fresh install).
No any connection: nor PC with Ethernet (to a router) or NB with Wi-Fi (to the 
same router).
Even now to find solution I had to boot under LiveCD!

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https://bugs.launchpad.net/bugs/1349108

Title:
  Disconnections problems each day after upgrade linux-firmware:amd64
  (1.127.4, 1.127.5)

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