Installation of latest version goes without problem but Ethernet is not showing up as available networking option.
Does Elementary support RTL8125 2.5GbE Controller at all?
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If possible, could you try connecting the machine to the internet via Ethernet over USB? This could be via adapter, directly from the router/modem, or tethering from a phone. Assuming this step works, fully update your system. The 5.4 kernel should include fixes for many RT devices. Once updated, make sure to restart, and if necessary, reconnect to Ethernet over USB and search for available drivers in AppCenter in the "Installed" tab or by using the
sudo ubuntu-drivers autoinstall command.