Hi @matte0 and welcome,
If you got a BQ U Plus, there already is an existing port for it.
Sadly it's not available in the UBports installer so in order to get installation instructions, I suggest you read this thread:
Or you can try to reach out for @Guf
Hi, thank you for the welcome, so I followed the link you put and I successfully installed ubuntu on the phone, a good job as an OS but not being finished yet I decided to wait for the final release because some things are missing that I need as the ability to record videos and take photos, and the hot spot among the main ones that interest me, I also noticed that the back and home buttons do not work maybe it must be like this and I'm used to using them on android we will see in the final release and only later i found this page https://devices.ubuntu-touch.io/device/tenshi/ where it shows the progress of the release, great work for the developer. Congratulations again.