Last night I ok’d the usual upgrades on my Ubuntu 14.04 LTS desktop and upon restart I was unable to acquire an internet connection.
After a bit of google (via windows) I found enough information to repair the Network Manager on my Ubuntu 14.04 (Trusty Tahr) machine AND how to prevent the install from happening again next time.
When I checked the error message it told me that the Network Manager had crashed.
 First I used the following command to find out what the latest installs had been:
$ tail -n25 /var/log/apt/history.log
The install had included:
which I determined were related to the Network Manager
 With further searching I found the page (see link below) that told me I could copy the previous version files into the apt-get archives and install them:
[2.1] moved out the files (above) from /var/cache/apt/archives
[2.2] Downloaded and copied into /var/cache/apt/archives:
[2.3] Then install each with:
dpkg -i libnl-3-200_3.2.21-1_amd64.deb libnl-genl-3-200_3.2.21-1_amd64.deb libnl-route-3-200_3.2.21-1_amd64.deb
[2.4] Restart Ubuntu and voila! All good again.
Now, I’m just not sure how to ‘pin’ the version so it will not keep updating (at least until they fix this).
[UPDATE] Found this post about how to lock the version of the libnl apps (note that I locked everything that had libnl in the app name, so that was 19 files)
p.s. Also, I found it tedious to try to report this to ubuntu and finally gave up… it needs to be easier to report a bug.