I've just upgraded ubuntu 19.04 to 19.10. The worst problem that I have is this :
root@ziomario-Z390-AORUS-PRO:/home/ziomario# ping www.google.it
ping: www.google.it: Errore temporaneo nella risoluzione del nome
I'm not able to connect to internet anymore. To fix that,I should give the dhclient command and after that I should wait 15 minutes before that I can connect. For this problem I have started another thread here :
I've reinstalled ubuntu 19.10 on another disk and there the connection works great. So,I've thought,if there is a way to backup all the net configuration files from the working ubuntu installation and restore them on the ubuntu that has a broken net configuration.