With telnet I have see it is a mount failure.
On Telegram a man say to Put the .IMG file in data folder
I have put boot.img and ubuntu.img, but I think ubuntu.img is sufficient.

And now it work

@MrT10001 and @Jules
Ok thanks

Hello,
Thanks to all for yours messages.

I have install a global MIUI 12.5.9 with Android 11 and after :

• The TWRP
• The devel-flasable-focal : ubuntu as system and boot as boot

My phone won't boot is stay on Poco screen.

I have try to format data in ext4 and to format all data to remove encryption and it is the same.

I have test Droidian and it have work.

@ds2k5 and @ikoz It directly work on your phone ?

Thanks in advance

Hello,
I look for Ubuntu Touch and UBports, for a long time ago !
Thanks for your great work.
I not yet try it, but I will do very soon.

I'm looking that Poco X3 and Poco X3 Pro, have similar hardware so I searched if Poco X3 Pro is supported today.
I find https://forums.ubports.com/topic/10451/poco-x3-pro and https://forums.ubports.com/topic/8707/poco-x3-pro and https://forums.ubports.com/topic/8483/port-for-poco-x3-pro/10
And the gitlab : https://gitlab.com/ubports/porting/community-ports/android11/xiaomi-poco-x3-pro/xiaomi-vayu/

So I think the Poco X3 Pro is compatible, anybody have test it ? Can you confirm it ?

Thanks in advance.

Have a good day.

David