How to configure interfaces in Ubuntu?
You can set an IP address via the graphical user interface in Ubuntu. From the desktop, click on the start menu and search for Settings. From the Settings window, click on the Network tab. Then from the right pane, select the interface and click on the gear icon to open the settings for that interface.
Where are the interface config files in Ubuntu?
On Ubuntu 20.04, the system identifies network interfaces using 'predictable network interface names'. Netplan configuration files are stored in the /etc/netplan directory.