Comment 6 for bug 1883239

I believe I was hit by the same bug. I'm using Ubuntu 20.04 on a ThinkPad X1 Carbon 4th. Manually installing the missing linux-modules-extra for 5.4.0-37 brings networking back, but I still had problems getting the system to detect external monitors. That is why I stay on 5.4.0-33 for the moment.

However, even on 5.4.0-33, the detection of external monitors sometimes fails. That means that aspect could be a false alarm (on my system). What I can confirm is that for me networking is definitely broken because of the missing linux-modules-extra, which were automatically installed for 5.4.0.33 but were missing in 5.4.0.37. After manually installing the package, networking works as before.