I do not install Ubuntu often. However, I have this problem twice now.
The first time I ignored it, continued the installation with DHCP enabled, and manually configured the network adapter after installation.
Now I am in a completely different network, a completely different hardware, etc. and try again to perform a basic installation of Ubuntu Server 18.04.
I come to the early stages, the installation finds a DHCP adress for the network adapter and gives me the possibility to reconfigure it at this time. I edit the settings and specify the network information I want to use for IPv4 after selecting "Manual" for the IPv4 method:
If I choose the settings "save", the installation will be restarted immediately on the first screen and the settings will be deleted.
This is the second time that I've installed Ubuntu 18.04 with exactly the same problem on completely different networks and hardware. I am 0 for 2 and can not even find a clue on the internet about this problem.
Why is this happening?
EDIT: I found this post without any response: https://askubuntu.com/questions/1124742/ubuntu-18-04-2-lts-server-network-configuration-problem-during-setup?newreg=444bcbeb65ab498b92298f80ad9427dc