Ubuntu-can't get auto dhcp to work :(

I am an Ubuntu 10.10 user. I have some issues getting my wired network(eth0) to connect to the dhcp server.

I have come across that my /var/run/dhclient.eth0.pid shows the following:

syntax error. Last token seen: d Garbled time

I am guessing my dhclient is not working properly. And I dunno why!!

I have another Ubuntu system with 11.04 and the same log file under /var/run/dhclient.etho.pid has a PID number.

That apart, the two systems use the same network config, auto eth0, automatic dhcp in my NM.

The resolv.conf has the right namerservers.

Any idea how I can fix this??

Thansk in advance