can't connect to Internet - DNS?

[Tom H]

On Mon, Nov 12, 2012 at 12:59 AM, rikona <rikona at sonic.net> wrote:
>
> One of my 10.04 boxes can no longer see the Internet. Just happened -
> has been working fine for quite a while. Nothing has been changed or
> updated on that box, or the local net, or any other box. It can see
> the other boxes on the local net, but not outside. Seems to be a DNS
> problem. For some reason resolv.conf [on that box ] no longer has the
> 'nameserver' line. If I put the correct line there, save, check it to
> make sure it is changed, and reboot, it is again gone. How can I get
> it to stay, and/or fix this in perhaps another way? And, why did it
> 'just happen'?
>
> In checking the net it is suggested to use network manager. I don't
> seem to have network manager installed, even though Synaptic seems to
> think it is. Do I need that tool to set this correctly?

What's the output of:

aptitude search -F "%c %a %M %30p %10t %20v %20V"
"?or(dnsmasq,network-manager,resolvconf)"

ps -ef | grep dhc