@stanwood
Thanks a lot for your fast answer.
I'll try to re-install on Linux and let you know.

@Josele13
Yes Location activated

@Josele13 ,
@stanwood
Maybe I will re install lineageos or flash a stock Rom to see if GPS is still working.

@Josele13
@stanwood
I installed lineageos 17.1 with open_Gapps pico (minimum).
The phone is quite reactive.
=>GPS OK on Sygic offline navigation app.
So I'm not sure I can find the energy for, once again, install UT.
I managed to swipe the system partition (!) and was unable to flash a stock rom. Too many "how to" on internet made me confused.
My phone is still alive, fortunately, and I think it's safer to keep it as it is now, with this light Android os.
Another time, I hope.
Thanks a lot for your help guys.
Long live to Ubunbtu Touch.

@Josele13 ,
@stanwood
Maybe I will re install lineageos or flash a stock Rom to see if GPS is still working.

@Josele13
Yes Location activated

@stanwood
Just reinstall from zero.
Same "gps interface not found".
Get the finger print that was laccking previously. Anyway its buggy.
Don't know what to do to get GPS active.
Regards

@Josele13
I already restarted the phone and GPS is on.
As no GPS interface is found, no app can get it !

@stanwood
Thanks a lot for your fast answer.
I'll try to re-install on Linux and let you know.

Hi, everybody.
Thanks to developpers for the good job.
I just set my Redmi Note 7 under Ubuntu Touch.
Feel good BUT :
GPS not working ! command test_gps said :
"gps interface not found :("
I used the UBPorts installer on Windows 10.
Maybe should I do it again under Linux Mint ???
I made a system update through "Development channel" but nothing new ! As I can see.
Any idea of how to solve this ?
Have a good day.