certificate verification Error 발생 시 해결 방법 발생 에러) 액세스하려는 리포지토리의 SSL/TLS 인증서에 문제가 있음을 나타낸다. `Err:7 https://repo.*****/1/ubuntu bionic Release` `Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. Err:8 https://repo.***/ubuntu bionic Release` `Certificate verification failed: The..