Hmm. My partner’s Linux machine is perfectly stable and has been for a decade. I administer it for them, but that’s just running updates and distribution upgrades every now and then
My server takes more effort, as distribution upgrades sometimes break stuff, for example the mailing list manager I have used for a long time became deprecated and was disabled on the recent LTS upgrade
My laptop running Ubuntu from the factory is perfectly fine, I’ll probably make it less stable by moving it to Debian