I’m unsure if this is a Linux specific issue but when I add or remove a hard drive steam will unlink family share which is a hassle to relink, I know it’s a niche question but does anyone know if reformatting a disk or partition will also cause an unlink? Thank you in advance.
I think it’s account linked, not device linked.
Changing hardware definitely unlinks it as I’ve had to relink it every time I remove or add a hard drive or ssd.
I’ve had issues with family link staying linked on a steam deck with zero hardware changes, so it could be unrelated to your hardware changes fwiw.
I’ve changed my OS three times since I set up my main games SSD (where my steam library lives) and with each OS change, I copied my .steam folder from home to the new home folder. Had zero issues with family sharing.