Trouble whit ethernet card

[Marcelo Garcia / Supermar]

Hello,

I'm changing a conectiva server by a Ubuntu 7 server. But i have two 
ethernet cards on my server, and just one (onboard) is up by server.
lspci show de two cards, without IRQ conflicts, but when run ifconfig IP 
netmask MASK i received the message "No such device".
At conectiva i had a modprobe archive, in this file i could put the eth and 
its alias.
How can i setup the second ethernet card ?

Detail - I disable de onboard card, i change de ethernet card offboard, and 
the problem still persist
Please, somebody can me help ???

Thank you

Marcelo Garcia