I installed the same Ubuntu 9.04 using VMWare Station on a laptop running Win XP, and desktop running Windows 7. Both machines are connected to the same ADSL Modem/router.
when running Ubuntu on the laptop, i'm able to ping and browse the internet with no problems. But when on the desktop, i'm not able to browse the net, i'm only able to ping.
I don't want you to think that i didn't google the problem, here are the links that i looked at with no success.
Again, the same image used in the installation on the laptop running XP was used for the PC running Windows 7, and same VMWare Station.
so the variable here is the Network Card.