Booting Ubuntu causes LAN to stop working in Ubuntu and Windows until BIOS reset

Solution 1:

Since you are experiencing this problem in two different operating systems, it could be a hardware issue with the network card. Try performing a power reset or hard reset on the system.

The following steps are how to perform the reset:

1. Shut down the computer.
2. Remove all power from the computer. (If it is a laptop, remove the battery)
3. With all power removed, press the power button and hold it for 15 seconds, or press it a few times in a row.
4. Connect power back to the computer and power it back on.

If this procedure does not work it could be an actual hardware failure and needs to be replaced.

This procedure can work with fixing computers that will not power on, network cards running slow, hard drives not being detected, etc. Motherboards have capacitors on them that store power. The slow power drain from capacitors can keep power going to other parts of the motherboard keeping memory in them when the computer is powered off. Pulling the power and pressing the power button will cause the motherboard itself to try to power back on. This causes all the capacitors to be drained thus clearing any memory stored.

Hope this helps!