güncelleme yaparken apt-get, güven zinciri kırıldı

Bu sabah sunucumu yeniden başlattım ve yaparken bir sorun keşfettim apt-get update:

Err:1 http://hwraid.le-vert.net/ubuntu xenial InRelease
  Could not resolve 'hwraid.le-vert.net'
Err:2 http://ppa.launchpad.net/certbot/certbot/ubuntu xenial InRelease                                        
  Could not resolve 'ppa.launchpad.net'
Err:3 http://us.archive.ubuntu.com/ubuntu xenial InRelease                                                    
  Could not resolve 'us.archive.ubuntu.com'
Err:4 http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease           
  Could not resolve 'ppa.launchpad.net'
Err:5 http://security.ubuntu.com/ubuntu xenial-security InRelease      
  Could not resolve 'security.ubuntu.com'
Err:6 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease     
  Could not resolve 'us.archive.ubuntu.com'
Err:7 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease
  Could not resolve 'us.archive.ubuntu.com'
Err:8 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 InRelease
  Could not resolve 'repo.mongodb.org'
Err:9 https://download.docker.com/linux/ubuntu xenial InRelease
  Could not resolve host: download.docker.com
Err:10 https://deb.nodesource.com/node_8.x xenial InRelease
  Could not resolve host: deb.nodesource.com
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial/InRelease  Could not resolve 'us.archive.ubuntu.com'
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease  Could not resolve 'us.archive.ubuntu.com'
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease  Could not resolve 'us.archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease  Could not resolve 'security.ubuntu.com'
W: Failed to fetch https://download.docker.com/linux/ubuntu/dists/xenial/InRelease  Could not resolve host: download.docker.com
W: Failed to fetch http://hwraid.le-vert.net/ubuntu/dists/xenial/InRelease  Could not resolve 'hwraid.le-vert.net'
W: Failed to fetch http://ppa.launchpad.net/certbot/certbot/ubuntu/dists/xenial/InRelease  Could not resolve 'ppa.launchpad.net'
W: Failed to fetch http://repo.mongodb.org/apt/ubuntu/dists/xenial/mongodb-org/3.2/InRelease  Could not resolve 'repo.mongodb.org'
W: Failed to fetch https://deb.nodesource.com/node_8.x/dists/xenial/InRelease  Could not resolve host: deb.nodesource.com
W: Failed to fetch http://ppa.launchpad.net/ondrej/php/ubuntu/dists/xenial/InRelease  Could not resolve 'ppa.launchpad.net'
W: Some index files failed to download. They have been ignored, or old ones used instead.

Şimdi bu önemli bir şey değil, ortak sorunları biliyorum ve aptbunlardan birkaçını denedim, ancak sorun giderme sırasında ilginç bir şeyle karşılaştım, güncellemeyi ne zaman çalıştırsam şunu syslogalıyorum:

Dec 10 09:11:37 magic named[2715]: validating _http._tcp.us.archive.ubuntu.com/SRV: bad cache hit (com/DS)
Dec 10 09:11:37 magic named[2715]: broken trust chain resolving '_http._tcp.us.archive.ubuntu.com/SRV/IN': 10.0.2.1#53
Dec 10 09:11:37 magic named[2715]: validating _http._tcp.repo.mongodb.org/SRV: bad cache hit (org/DS)
Dec 10 09:11:37 magic named[2715]: broken trust chain resolving '_http._tcp.repo.mongodb.org/SRV/IN': 10.0.2.1#53
Dec 10 09:11:37 magic named[2715]: validating _http._tcp.ppa.launchpad.net/SRV: bad cache hit (net/DS)
Dec 10 09:11:37 magic named[2715]: broken trust chain resolving '_http._tcp.ppa.launchpad.net/SRV/IN': 10.0.2.1#53
Dec 10 09:11:37 magic named[2715]: validating _http._tcp.hwraid.le-vert.net/SRV: bad cache hit (net/DS)
Dec 10 09:11:37 magic named[2715]: broken trust chain resolving '_http._tcp.hwraid.le-vert.net/SRV/IN': 10.0.2.1#53
Dec 10 09:11:37 magic named[2715]: validating _http._tcp.security.ubuntu.com/SRV: bad cache hit (com/DS)
Dec 10 09:11:37 magic named[2715]: broken trust chain resolving '_http._tcp.security.ubuntu.com/SRV/IN': 10.0.2.1#53
Dec 10 09:11:37 magic named[2715]: validating deb.nodesource.com/A: bad cache hit (com/DS)
Dec 10 09:11:37 magic named[2715]: broken trust chain resolving 'deb.nodesource.com/A/IN': 10.0.2.1#53
Dec 10 09:11:37 magic named[2715]: validating download.docker.com/CNAME: bad cache hit (com/DS)
Dec 10 09:11:37 magic named[2715]: broken trust chain resolving 'download.docker.com/A/IN': 10.0.2.1#53
...

Bunun ne anlama geldiğini ve Google’ın şu ana kadar bana yardım etmediğini anlamadım, bunun anlamı nedir ve başarıyla nasıl düzeltebilirim?

"Çözülemedi", sırayla kırılmış güven zincirine neden olan bir DNS çözme sorunu yaşadığınızı gösteriyor. DNS ayarlarınızı incelerdim - pingbir etki alanı adına basit bir işlem yapmak (IP adresi değil) bu teoriyi doğrulamalıdır. ping us.archive.ubuntu.comMesela dene .