Mobian
The Mobian project aims to bring Debian on PinePhone and is based on Phosh.
Also see Mobian on pine64 wiki
Project wiki: https://wiki.mobian-project.org/
IRC: #mobian on OFTC
Matrix.org: #mobian:matrix.org
Telegram: https://t.me/mobian_project
Salsa: https://salsa.debian.org/Mobian-team/
Gitlab: https://gitlab.com/mobian1
For installation instructions see InstallingDebianOn/PINE64/PinePhone