Ubuntu touch project runs linux on a tablet while retaining the phone/android functionality

https://en.wikipedia.org/wiki/Ubuntu_Touch

https://ubuntu-touch.io/

https://docs.ubports.com/en/latest/userguide/install.html

https://liliputing.com/ubuntu-touch-mobile-linux-distro-is-now-based-on-ubuntu-24-04-lts/

There’s a list of supported devices there. Lenovo was one