Can NOT install UT Redmi note 9 pro "exit code 256"

[smobilesoft]

Hi, after "some" formats, android re-installs and UT install fails, I will try some help now.

After re installing UT, I had many issues and one of them was pretty bad, I could not call landlines that did not have dial tone.
I read that you have to re install Android if you have BIG issues, so, after reading a LOT of posts, I end up selecting the following to choose the version: https://forums.ubports.com/topic/7686/install-ut-on-xiaomi-note-9-pro

So I install via fastboot the V12.0.1.0.QJZEUXM

Downloaded the final version of ubports-installer_0.11.2 and start the UT install.
During the installation I have an error:Error installing Ubuntu update, exit code: 256

I will upload the log files
last_kmsg.log recovery.log ubuntu_updater.log

I have the exact same issue with this guy here at the reddit site

I tried his solution without much luck:
Load into fastboot (bootloader), then run fastboot resize-logical-partition system 3900000000

What am I doing wrong?

Can I have some help, please?
Thanks
Alex