I have 2 computers an AMD based desktop with Ubuntu desktop upgrades since 12.xx to 14.xx to 16.xx and very early on to 18.04 LTS. The network interface cannot be configured and my network connecttion often fails. in 16.04 that was much easier.
A laptop Samsung R540 I5 with Ubuntu desktop i tried to install 18.04 but the network didn't work, so I installed 16.04 LTS.
I have tried several times to address this situation here and questions have been removed, an incomplete description has been posted (that I cannot find anymore) to remove netplan and go back to IPwhatever. but it didn't solve my problem as some commands didn't result in the required changes or edits to config files were not described in a way that i could understand. my request didn't result in a workable solution
I have a setup on my desktop with many applications and with thesaurus and spellchecker files that have grown, and a lot of config data which I do now where they are and that I lack on my laptop because I don't know where they can be found and tranferring the is undocumented.
Moreover it was installed for using LVM, despite me requesting that LVM wasn't used. I dread the consequences of the fact that I need to reinstall this - which will have to happen anyway - with 16.04 LTS and even when I do so I will have to upgrade not before long and move to 18.04LTS and on to 20xx LTS. But I need an answer to the question * how i can go back to the old Network/IP configuration tools such that i can replicate that after the upgrade to 18 and later 20 LTS lets say based on the config files of 16.04 LTS
output as requested :
derek@Avenger:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8) auto enp3s0 iface enp3s0 inet dhcp
derek@Avenger:~$ cat /etc/netplan/*.yaml cat:
'/etc/netplan/*.yaml': No such file or directory