I am trying to configure my network connection on my
machine, but it wont auto detect and there is no roaming mode (im
running a newly installed Ubuntu 8.10 Intrepid OS. I have the output
Before trying any of the other suggestions, you should verify that your
AMD desktop machine actually has a valid network connection.
There are some commands you can run inside linux to detect link status
as well. "sudo ethtool eth0" should work. Check for the line that says
"Link detected:" - it's the last in the output on my system.
If you don't have a link detected, then check that the network cable is
of the right type and is plugged in correctly at both ends - remove it
and push it back in again. Verify that both your network switch and the
network card in your desktop show the link light. If they don't, try a
cable that you know works - eg, one from a different computer.
FYI, Ubuntu's default settings after install are for network manager to
do DHCP on the network connection, and there is no default firewall.
Finally, if you are sure that:
* This computer in question has a valid network link
* It's plugged into the same switch that your other systems are plugged into
* The other systems are getting valid DHCP leases
Then you could always try statically configuring this interface. Go the
System menu, then Preferences, then Network Configuration, then select
eth0, then give it suitable values for your system (eg, an unused IP
address, the correct netmask, and the IP address of your gateway machine
as the gateway / default route).
If, in the Network Configuration ("Network Connection") wizard, there is
no eth0 link, it means you or something has tried to configure it
manually inside /etc/network/interfaces, and network manager is refusing
to touch it. You'll have to edit the file yourself in that case. I think
other people have pointed out how.