@MrT10001 I think it don't. Didin't check that.

@Keneda okay thanks, i'll contact him.

I know Ubuntu Touch has its own recovery, i installed twrp only to solve the problem.
TWRP can boot to UT but it gets broken too after a while. I only can boot to UT with TWRP rn.

I flashed TWRP again to boot UT, now it got broken again. Maybe a firmware issue? Because i can't boot to anything with "fastboot boot xyz.img" when something gets broken.

@Keneda The installer says that i need to install Android 9, so i am trying with true rom.
Also, i can't boot twrp with "fastboot boot" but when i flash it i can open twrp. And rebooting to system from twrp boots to Ubuntu Touch. So strange.
I only have problems with boot. Everything is perfect expect this problem.

My device is Xiaomi Mi 6 6/128 Model.
I am installing Ubuntu Touch stable with Ubports installer, it installs without a problem and works great when it boots the first time.
But when i reboot my device a few times, the phone freezes at MI logo. I only can enter fastboot and can't boot TWRP from fastboot.
Now, i installed it again and the phone REBOOTED ITSELF after 30 seconds, and stuck at MI logo again. I only can fix this with flashing stock rom
Tried in both Android 9 lastest stock rom and LineageOS 20.