Breakdown of settoappu ga owatta.

Questions & Answers about settoappu ga owatta.
セットアップ is a loanword from English setup. In Japanese, katakana is commonly used for foreign loanwords, especially in technology, business, and computing.
In this sentence, セットアップ usually means something like:
- software installation/setup
- device configuration
- system setup
- getting something ready for use
So it sounds very natural in a technical context.
が marks the thing that ended / finished.
The verb here is 終わる, which means to end or to be finished. Since 終わる is an intransitive verb, the thing that finishes is marked with が.
So:
- セットアップが終わった = The setup finished = The setup is done = Setup has ended
English often phrases this as I finished the setup, but Japanese may express it as the setup finished.