Well it's possible packages are broken in the update, but I doubt it. Perhaps we need to do some investigation.
Like when it is working what is the output of lsmod, and when it doesn't work what is the output of lsmod? Maybe a driver is not being loaded after the update for your network card, maybe the modules need to be rebuilt against an updated kernel?
What are the contents of /etc/network/interfaces while your system works and when it doesn't, any changes?
If we open a console and type ifconfig what is the output when things are working and what is it when they are not working.
This could be caused by any number of things. A module not loading, a misconfigured interfaces file, the interfaces not being up, a broken package, multiple applications vying for control over networking, or any number of things I can't even think of.
These outputs would greatly assist us in assisting you.
Alex
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