Ubnutu apt update시 Certificate verification failed 에러 처리

 

 

 

 

echo -n | openssl s_client -connect 접속하고자하는주소:443 | \
  sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | \
  sudo tee -a '/usr/local/share/ca-certificates/download_01_org.crt'
sudo update-ca-certificates