sharing if anyone is having trouble with the ubports installer (as I did) getting an error saying not having write permissions to sideload cache, or UT is not installing..

I found that booting to twrp in fastboot mode ./fastboot boot twrp.img
then wiping the phone in twrp menu, will remove encrypted partitons allowing the installer to write to the device.

see link for more files/ info: ubport 6/6t files

ubuntu touch now working here!