Here’s my build of LineageOS 15.1 for Raspberry Pi 3 Model B and Model B+ (bluetooth does not currently work on the new plus model). It is unofficial and unsupported by the LineageOS team. It’s for advanced users only. This build currently uses Google’s SwiftShader software renderer so display performance is probably not what you’d expect. This build is not meant as a daily driver and it’s certainly not suitable for media device use.