[ubuntu] Icon said networking disabled but my Internet is working

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http://ubuntuforums.org – And I can't upgrade to Ubuntu 10.10 because it said that there's a problem with my network connection. When there's none, since I am typing this now. This is what ifconfig -a says about it: eth0 Link encap:Ethernet HWaddr 90:fb:a6:2f:35:78 inet addr: Bcast: Mask: inet6 addr: fe80::92fb:a6ff:fe2f:3578/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3593 errors:0 dropped:0 overruns:0 frame:0 TX packets:2355 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 (HowTos)