apt update 진행시 아래와 같은 에러가 발생하였다.
Err:5 https://dl.yarnpkg.com/debian stable InRelease
The following signatures were invalid: KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1580619281 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://dl.yarnpkg.com/debian stable InRelease: The following signatures were invalid: KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1580619281 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983
W: Failed to fetch https://dl.yarnpkg.com/debian/dists/stable/InRelease The following signatures were invalid: KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1580619281 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983
W: Some index files failed to download. They have been ignored, or old ones used instead.
결론적으로는 yarn GPG 인증서 만료 문제이다.
아래와 같이 해결할 수 있다.
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
출처 https://github.com/yarnpkg/yarn/issues/4453