[ubuntu] 1 Gbit speed doesn't work, get only 100 Mbit

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http://ubuntuforums.org – Dear All, I have Dell PowerEdge T 1800 server. I have installed ubuntu 11.10 x64 desktop version. The PC has 1 Gbit ethernet card but under Ubuntu the ethernet card is working only 100 Mbit. I have made new installation with the new Ubuntu 12.04 but the problem is same. The ethernet work well but only 100 Mbit. I have done all updates nothing is changed. There is any solutions to use the ethernet card with 1 Gbit speed ? Best Regards ButyiBa (Hardware)