I ran into this issue recently where it would reboot to the recovery while loading. MindtheGApps didn't work. OpenGApps nano didn't work. The only one that worked was basic FlameGApps. (https://sourceforge.net/projects/flamegapps/)i have 2 devices on both same problem-is there any partition problem?
so i solved the problem while first installed lineage 17.1 unofficial - bootet up and configured ready.
than back to recovery and installed lineage18.1 + mindthegapps
than it worked
thanks for help
@mosimchah Is there an advantage/disadvantage of one installer over another?