could not resolve 'localhost'

[lynx shadow]

i can get through the internet on my dual-boot laptop (i have win xp and ubuntu gutsy gibbon), but when i try to update some files, i get the message 'could not resolve "localhost"'.

i have '127.0.0.1 localhost' in my /etc/hosts file. i tried '127.0.0.1 localhost:4001' but still got the same message.

i'm not sure i have a file /etc/networks/interfaces

what can i do? please HELP!
:cry:

[cariboo907]

What are you trying to do? Is your computer named 4001? your /etc/localhost should look something like this:

127.0.0.1 localhost
127.0.1.1 intrepid

In your case replace intrepid with your hostname. I you don't know what your host name is, in a terminal type:

hostname

To see the contents of your /etc/network/interfacces etiher navigate to it from nautilus, double click on File System then double click /etc then network, then double click interfaces, or the fast way , open a terminal and type:

cat /etc/network/interfaces

It should show you something like this:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
#iface eth0 inet dhcp

Jim