[ubuntu] intermittent Internet on 10.10 Server with Ubuntu Desktop

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http://ubuntuforums.org – Hello, I have been running 10.10 server with no GUI for a few months without issue. I decided to install ubuntu desktop (GUI), because I want to turn it into a media server, and I'm finding that my Internet browsing fails intermittently. i.e. I can get google.com sometimes and sometimes not. I have tried traceroute and found that I do not reach my local router on addresses that fail, and yet I get a full trace on addresses that are ok. Ping tests too. I remember from some time ago that the GUI may cause a network problem but I'm not sure. By the way, other computers on the network can acce (HowTos)