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
为什么这里显示‘internal.serevr’？