Oui, j'ai tenté 3 cables rj45, dont un neuf que j'ai acheté hier, rien n'a changé...
mamanpapa@mamanpapa-B450M-S2H:~$ echo; dpkg -l | awk '!/^rc/ && / linux-(c|g|h|i|lo|m|si|t)/{print $1,$2,$3,$4 | "sort -k3V | column -t"}' ; echo -e "\nNoyau courant : $(uname -mr)"
ii linux-headers-5.4.0-58 5.4.0-58.64 all
ii linux-headers-5.4.0-58-generic 5.4.0-58.64 amd64
ii linux-image-5.4.0-58-generic 5.4.0-58.64 amd64
ii linux-modules-5.4.0-58-generic 5.4.0-58.64 amd64
ii linux-modules-extra-5.4.0-58-generic 5.4.0-58.64 amd64
ii linux-headers-5.4.0-65 5.4.0-65.73 all
ii linux-headers-5.4.0-65-generic 5.4.0-65.73 amd64
ii linux-image-5.4.0-65-generic 5.4.0-65.73 amd64
ii linux-modules-5.4.0-65-generic 5.4.0-65.73 amd64
ii linux-modules-extra-5.4.0-65-generic 5.4.0-65.73 amd64
ii linux-generic 5.4.0.65.68 amd64
ii linux-headers-generic 5.4.0.65.68 amd64
ii linux-image-generic 5.4.0.65.68 amd64
ii linux-image-5.8.0-43-generic 5.8.0-43.49~20.04.1 amd64
ii linux-modules-5.8.0-43-generic 5.8.0-43.49~20.04.1 amd64
ii linux-modules-nvidia-440-generic-hwe-20.04 5.8.0-43.49~20.04.1 amd64
ii linux-modules-nvidia-450-5.8.0-43-generic 5.8.0-43.49~20.04.1 amd64
ii linux-modules-nvidia-450-generic-hwe-20.04 5.8.0-43.49~20.04.1 amd64
Noyau courant : 5.8.0-43-generic x86_64
mamanpapa@mamanpapa-B450M-S2H:~$
mamanpapa@mamanpapa-B450M-S2H:~$