[reidjs]

What is the Ur-problem? I googled it and the top result was this post.

[_0ffh]

It means approximately "the original problem", i.e. where the problem ultimately stems from.

The prefix "ur" is derived from old high German "ur", old Nordic "ōr" or Gothic "us": "from, out of".

That there's an ancient city of that name is purely incidental.

[motohagiography]

https://www.dictionary.com/browse/ur