Upgrading to Ubuntu 20.04.1 LTS from Ubuntu 18.04 LTS resulted in a lost internet connection



leopintos11

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Also I came across this issue: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1859287

If you read through it you see that it was working and then someone else with Ubuntu 20.04 is having the same issues again. So it might be worth a try installing a newer kernel since according to the other source I linked says that the wifi should work with kernel 5.7 and above.
I upgraded from 5.4 to 5.11 kernel version and now it works all, the WIFI, the Ethernet, the screen brightness and volume keys of the notebook. However I had to do one of the following things: disable the secure boot, or sign the kernel. I opted to do the first one first, then once with the system running I signed the new kernel and activated secure boot again.

Thanks for your help guys!
 

sachin786

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This thread has been very helpful for me. I faced exactly same issue for the same Ethernet controller (Realtek Semiconductor Co., Ltd. RTL8111/8618/8411).

In my case, updating the kernel to 5.8.18 did the trick
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An article that shows how to new kernel version- https://itsfoss.com/upgrade-linux-kernel-ubuntu/#install-manually

I had tried out `netplan` related fixes. I was about to give up and install a fresh ubuntu 20.04. I tried ubuntu 20.04 using a bootable device and ethernet and the wifi was working fine, so I noted the kernel version number and installed the same on my PC and everything worked. Wasted almost a day, but did learn a few things along the way.

Thank you to everyone involved in this thread.
 

f33dm3bits

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In my case, updating the kernel to 5.8.18 did the trick

An article that shows how to new kernel version- https://itsfoss.com/upgrade-linux-kernel-ubuntu/#install-manually
There are several GUI tools that allow you to install the mainline kernel on Ubuntu, the advantages of using one of these tools over doing it manually is that you will also get kernel updates once they are available.
 
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