I managed to solve the problem by installing the r8168 driver version
8.048.03 directly from the realtek website.
https://www.realtek.com/en/component/zoo/category/network-interface-
controllers-10-100-1000m-gigabit-ethernet-pci-express-software
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** Attachment added: "dmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.8/+bug/1910646/+attachment/5450547/+files/dmesg.txt
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https://bugs.launchpad.net/bugs/19106
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https://bugs.launchpad.net/bugs/1910646
Title:
Can't connect to wired ethernet after update to kernel 5.8
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Public bug reported:
After today update from kernel 5.4 to kernel 5.8 i can't connect to
wired connection, I have the same bug that has been reported upstream
https://bugzilla.kernel.org/show_bug.cgi?id=209839
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-36-generic 5.8.