I actually went back to 16.04LTS for a while due to this problem, but now the networking is functional under 17.04. _backup to its name to be safe, and create a new blank file. Either comment out (by inserting a hash at the beginning of each line) or delete all its contents to make it a blank file using a text editor such as gedit: sudo tee /usr/lib/NetworkManager/conf.d/nf < /dev/nullĪlternatively, backup the existing file, and add e.g. The wireless internet works, but whenever I plug in a working ethernet cable, the local area network says I still need to plug an ethernet cable in. Restarts showed this same exact thing, when I unplugged my Ethernet cable and used wifi, the issue went away and I had stable internet, my start ups and boots ups were fast again as well. Ethernet Port not detecting ethernet cable Hello I have a dell XPS l521 x laptop.

Connecting to wifi did not not help either, chrome was showing as host not resolved. If the Ethernet connector on your computer does not have LEDs, you can look at the router to verify that the LEDs blink when the network cable is connected. UPDATE: In addition to the above, the culprit seems to be the file with the same name in /usr/lib/NetworkManager/conf.d/. Whenever I clicked on network info, the lan connection showed as limited. The real question that should be asked is why are such critical things left unresolved for so long to cause needless worry and lost time for many people? This creates a blank file needed in the /etc/NetworkManager/conf.d directory which the installer fails at creating automatically.

Here is the fix for the LAN problem that first occurred mildly in 16.04, got a bit worse in 16.10 and became unbearable in 17.04 rendering it unusable: sudo touch /etc/NetworkManager/conf.d/nf

Lan cable not connected