I advocate accepting-answers (mainly by new users) for two reasons:

 1. It shows that the answer worked for *at least* OP.
 2. It is the only way for a new user to explicitly show that they found one working solution for their problem (note that a user needs to reach some fixed, albeit very small reputation before their upvotes are visible and counted).

I have a canned comment:

> If you find this answer useful, please consider ["accepting" it](https://askubuntu.com/help/someone-answers) (by clicking the tick (✓) next to it) to indicate you've found a working solution and also so that others may more easily find it in the future.

I post this comment (or a slight variant) *only* whenever I see a "*thank you, it worked*" comment by a newbie OP (and the associated answer is not accepted).

Newcomers must be taught IMO.