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DNS 확인 문제

tag-icon • tag-icon package-management system-installation upgrade dns
DNS 확인 문제 
Err:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
  Could not resolve 'internal.serevr'
Err:2 http://gb.archive.ubuntu.com/ubuntu xenial InRelease
  Could not resolve 'internal.serevr'
Err:3 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease
  Could not resolve 'internal.serevr'
Err:4 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease
  Could not resolve 'internal.serevr

왜 'internal.serevr'이 표시되나요?

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