Hi @adelzu,
As I was writing the Howto all was working finally with v25 - but as I now did my final setup, it stop working also.
Issue - Make log:
sudo: argv[2] mismatch
So, sudo isnt allowing it.
Build Issue from make.log:
Error! Bad return status for module build on kernel: 6.12.15-production+truenas (amd64)
Consult /var/lib/dkms/realtek-r8125/9.016.01/build/make.log for more information.
Here is - how this can be fixed:
Important: This change should be reverted after its done - because should not be allowed at TrueNAS in General!
From: Problems using "sudo su -" - #17 by letic
sudo visudo
Add:
Defaults !intercept_verify
and then run:
dpkg -i realtek-r8125-dkms_9.016.01-1_amd64.deb
Before also dont forget to run:
sudo apt-get update
packages list is missing at truenas because of appliance image.
Please revert the sudo change, when all is finally working. Thats it!
Maybe this helps also for you? 
Info: The updated howto is also available on my gh:
