Discourse 빌드 오류: rbtrace(0.5.1) 설치 중 오류가 발생하여 Bundler를 계속할 수 없습니다

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Debian 9 has been superseded by Debian 10 (“buster”). Security updates have been discontinued as of July 6th, 2020.

You may want to take your backup and migrate to a new server running a current OS version.