Teaching an Ubuntu laptop to recognize the Ethernet connection

Good advice from Joseph VanPelt

wired device not managed

I had the same problem with a fresh install on my Asus Eee PC 1005HA. The live environment worked with no problems, but once installed I couldn't get the connection to respond or to not read "device not managed". When I changed the text in this configuration file and restarted Network Manager everything worked!

gksudo gedit /etc/NetworkManager/NetworkManager.conf

for lubuntu:

gksudo leafpad /etc/NetworkManager/NetworkManager.conf

Now the text editor will open. Find the line managed=false and replace false with true and save the file (ctrl+s) and close the file.

Restart your computer or the NetworkManager service (sudo service network-manager restart).

This worked for me with Ubuntu 12.04 on an Acer laptop as well.