To add, I tried to install the stock image from Android -- specifically 6.0.1 (M4B30Z, Dec 2016), found here, which gave some errors and failed to fully install (though it did change the look of the bootloader.) I still was stuck with the UBports Recovery program.
@myii Thank You for the hint!
The phone was "clean" (resetted to factory settings) when I flashed it so there was nothing but the android-system on it - but I think I´ll rather reinstall and choose wipe-option this time...
@Marathon2422 I listened to some of the podcast 28 and I know that 16 is not totally ready but using it I think it definantly seems close.
@advocatux Thanks! That solved the problem! Still has very few apps now but like Marathon2422 said, their may be restocking the store with apps for 16.04. I know 15.04 is supposed to be more stable but this seems alright and I do want to submit error reports to help since this is stable enough for me to use as a daily phone. A lot of the problems I remember from last year or the year before are gone in this update I have installed now. Thanks for putting a link too. And I now use UTmedia since that works, but I wish I could use the File Manager to open the videos since that isn't suggested my UTmedia and the File-Manager doesn't list UTmedia as a was to open the video files. Oh well, it works alright for now. 🙂