so, I got myself here a nexus 6p that was running lineageOS 17.1 with some twrp modules, I did wipe it full and flashed stock thru the fastboot commands then i tried using the UBports installer and it only installs the recovery and no OS what to do? I'm new to this never installed UBT before or any full Linux on phone just roms and stuff with twrp

any help is appreciated thanks in advancee