@stanwood Thank you anyway for your support! I will contact XDA people to understand why your RN7 has gps and not mine. Have a nice day (night?).

SOLVED

I read through all the GPS topics on the Telegram channel, and understood that 'test_gps' could report "GPS interface not found" even when the GPS is working!

I did new tests, left my house, waited a few minutes outside and found that the GPS was working (Pure Maps or Google Maps). And indeed, in this state, 'test_gps' keeps saying "gps interface not found"... I thought it was trustworthy, but it is not!

So everything is fine, now.

Thanks to @Josele13

Hello to all contributors,
I already installed successfully UBports on my old Nexus5, last year. Now, I'm trying to install it on a Redmi Note 7, which comes with Android 10.
When I launch the UBports installer v0.9.1-beta, either under Win10 or Ubuntu, and click on the final "Continue" button (leaving all default values on each step), nothing happens: no message, no disk/ram/proc activity, just as if the click was not taken in account.

I have posted about this issue on this page: https://github.com/ubports/ubports-installer/issues/2177
Should I re-post here all my posts?

After spending 10 hours on this issue, trying manual install during last ones, I'm stuck: the RN7 never manages to boot into system. Recovery/Bootloader modes do work.

What can I do now?
Does anyone have the same issue?
I'm looking for fresh ideas to go ahead...