Ethernet does not work after applying many lessons

[Tarq]

Can you try following commands?

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sudo rmmod r8101
sudo modprobe r8169
sudo service network-manager restart

Yes, that is worth a try, before doing what I suggested.

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tarek@Inspiron-N5110:~$ sudo rmmod r8101
[sudo] password for tarek:     
tarek@Inspiron-N5110:~$ sudo modprobe r8169
modprobe: FATAL: Module r8169 not found in directory /lib/modules/5.4.0-64-generic
tarek@Inspiron-N5110:~$ sudo service network-manager restart
tarek@Inspiron-N5110:~$ 

[kelebek333]

tarek@Inspiron-N5110:~$ sudo modprobe r8169
modprobe: FATAL: Module r8169 not found in directory /lib/modules/5.4.0-64-generic

r8169 is a builtin kernel driver. Did you manually delete r8169 driver module for using r8101 driver module?

[sleeper12]

Try:

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 sudo rmmod r8169 && sudo modprobe r8169 && sudo systemctl restart network-manager.service