First attempt at solving a problem

It's a noun, but can probably be used attributively in most cases: stopgap.

stopgap NOUN

A temporary way of dealing with a problem or satisfying a need.

‘transplants are only a stopgap until more sophisticated alternatives can work’

{ODO}

A provisional solution is current usage.

• provisional (adjective) - serving for the time being, existing or accepted for the present time but likely to be changed - MW

1."...welcomes the fact that the Agri-Fish Council meeting on 14 November 2011 resulted in a provisional solution for maintaining the food aid programme."

2."The lesson to be learnt from London's case is, therefore, never to let a provisional solution become a permanent one."

3."But it can be that recourse to the reasonable only gives a provisional solution, waiting for the elaboration of new legal construction which would be more satisfying."

4. "interpretation is very good provided it is just taken as a provisional solution, useful until the true, final, solution is found."

Not a better choice than "provisional", A temporary solution also comes to mind.

• temporary (adjective) lasting, used, serving, or enjoyed for a limited time. - TFD

I’d use the term tentative:

​(of a plan or idea) not certain or agreed, or (of a suggestion or action) said or done in a careful but uncertain way because you do not know if you are right:

• I have tentative plans to take a trip to Seattle in July.

(Cambridge Dictionary)