Same symptoms, same result on a headless always-on box running 16.04.
Made worse by the fact that I have to hard-power off the box and hook it
up to monitor for troubleshooting. Every couple weeks the machine will
lose connection to the network.
Last time I thought I lost the on-board NIC and
I can report that I, too, had the same problem today on my Jaunty
install after updates done on 01/31/2010. I was able to successfully
rollback to the previous version of libglib2.0 and was able to open a
Network connection again.
The command that worked for me was
aptitude install
