[Discuss] Ubuntu won't talk to my router over the wire

[lconrad at laymusic.org (Laura Conrad)]

I'm having an odd networking problem.  My desktop computer has been
wired to the D-Link router for several years now, and all of a sudden
the other day I rebooted, and it wouldn't get an IP address.  When I
told it what IP address to get, it didn't get the DNS.  

At this point I was running LUBUNTU 12.10.  I had disabled the wireless
networking through some convoluted scheme I couldn't remember, so I
decided that it made more sense to upgrade to 14.04, since it had been
working pretty well on the new laptop.  (As usual, there are things
wrong with both printing and sound, but nothing I can't work around.)

14.04 reported that the wired ethernet was disconnected, and connected
fine to the wireless network, so I am functioning.  But I still didn't
understand why the wired network didn't work.  I tried a USB ethernet
adaptor, and that didn't work either.  Plugging the ethernet cable into
the laptop running on Windows 8.1 works fine, but when the laptop is
running ubuntu 12.04 it doesn't.

Googling finds some people who had to edit /etc/network/interfaces to
tell Ubuntu more information about the connection, but none of that
works for me.

Any ideas?

-- 
Laura   (mailto:lconrad at laymusic.org)
<https://plus.google.com/u/0/116029698292079786511>
(617) 661-8097	233 Broadway, Cambridge, MA 02139   
<http://www.laymusic.org/> <http://www.serpentpublications.org>

I'm at the very peak of my decline.

Leonard Bernstein