I installed ubuntu cosmic and upgraded so everything was on the latest package in the ubuntu repos. I rebooted and then the onboard network card failed to get an IP. Now this is not a guide on how to debug it, but just how i fixed it.

This is not my first rodeo and so I have a USB wifi card sitting in my box of cables just for these occasions. Once I plugged it in decided to try the original kernel. A quick reboot later everything was working fine. So it was a problem with the 4.18.11 kernel.

So I looked at how to patch to 4.19.1 to see if this fixed the problem and I came across UKUU from this link (https://www.omgubuntu.co.uk/2017/02/ukuu-easy-way-to-install-mainline-kernel-ubuntu)

This awesome app gives me a standalone interface for controlling which kernels i have installed and installing the latest. I used the app to install 4.19.1 did a reboot and everything worked fine.

By Chris Phillips on November 5, 2018.

Canonical link

Exported from Medium on April 6, 2019.