Could not execute 'apt-key' to verify signature (is gnupg installed?)

1 개요[ | ]

Could not execute 'apt-key' to verify signature (is gnupg installed?)
root@zetawiki:~# apt update
Hit:1 http://kr.archive.ubuntu.com/ubuntu xenial InRelease
Err:1 http://kr.archive.ubuntu.com/ubuntu xenial InRelease                                  
  Could not execute 'apt-key' to verify signature (is gnupg installed?)
Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]                  
Hit:3 http://kr.archive.ubuntu.com/ubuntu xenial-updates InRelease          
Err:3 http://kr.archive.ubuntu.com/ubuntu xenial-updates InRelease                          
  Could not execute 'apt-key' to verify signature (is gnupg installed?)
Hit:4 http://kr.archive.ubuntu.com/ubuntu xenial-backports InRelease                        
Err:4 http://kr.archive.ubuntu.com/ubuntu xenial-backports InRelease
  Could not execute 'apt-key' to verify signature (is gnupg installed?)
Err:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
  Could not execute 'apt-key' to verify signature (is gnupg installed?)
Fetched 102 kB in 1s (64.8 kB/s)
Reading package lists... Done
Building dependency tree       
Reading state information... Done
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: http://kr.archive.ubuntu.com/ubuntu xenial InRelease: Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://kr.archive.ubuntu.com/ubuntu xenial-updates InRelease: Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://kr.archive.ubuntu.com/ubuntu xenial-backports InRelease: Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com/ubuntu xenial-security InRelease: Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dists/xenial/InRelease  Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease  Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease  Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease  Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Some index files failed to download. They have been ignored, or old ones used instead.
2 같이 보기[ | ]

apt update
3 참고[ | ]

https://askubuntu.com/questions/198371/apt-encounters-errors-with-bad-gpg-keys