I have this problem to
My laptop use a Realtek RTL8139!!!
Instaled Ubuntu 8.04 and No network access, the Kernel know my network
card, no apparent errors in log systembut no Work.
Before i use Ubuntu 7.10 no problem.
--
Realtek RTL8139/810x Family Fast not working u(Hardy 8.04)
Public bug reported:
I use Ubuntu 7.10 and no have a problem, today I make upgrade im my
system.Make a new instalation Ubuntu 8.04!!!
My kernel Know my network card RTL8139, he automatic UP the 8139cp
module but no network access.
I make manual change the module to 8139too but no network