Got #lineageos on an old Galaxy S6 finally! My wife has been upset for months that I hadn't got it working haha. The problem was the Korean market Galaxy S6s had a "system" partition 200MiB smaller than the LineageOS system image. I had tried repartitioning (trying to upload new PIT files) to expand the system partition with no luck. Today I tried doing a manual repack and it worked! Will do a proper writeup at some point.