@Andy2,if you looking for a system without bugs / problems … well Good Luck! And the heavier the user you are, the more likely you will find some bugs. As far as stable (not completely bug free) goes you can do a search on the internet like I did. Here are 2 statements I found.
------- Dated December 2017 ----- Dated but LTS releases follow the same path.
“Ubuntu long-term support (LTS) releases, when they’ve been out as long as they’ve all presently been out (1 year and 8 months for 16.04, 5 years and 8 months for 14.04). Their derivatives too like Linux Mint. Their packages have been used by millions of people for over a year now, so any bugs should have been reported and fixed by now.”
------ Same report, but about Debian. ------
“Debian (stable) — its packages start off in the unstable branch, then after adequate testing they transition into the ‘testing’ branch (which is used as the basis for packages in Ubuntu’s repositories), then from there they eventually transition into the stable repositories. This process of evaluation takes months or even years.”
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