[ubuntu] apt-get 오류 / ubuntu 18.04 LTS

sudo apt-get update

명령어를 실행했는데 언젠가 부터 아래와 같은 오류가 남. 

Err:1 http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease
  Temporary failure resolving 'ppa.launchpad.net'
Err:2 http://archive.ubuntu.com/ubuntu bionic InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Err:3 http://dl.google.com/linux/chrome/deb stable InRelease
  Temporary failure resolving 'dl.google.com'
Err:4 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Err:5 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Err:6 http://archive.ubuntu.com/ubuntu bionic-security InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-security/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://ppa.launchpad.net/certbot/certbot/ubuntu/dists/bionic/InRelease  Temporary failure resolving 'ppa.launchpad.net'
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/InRelease  Temporary failure resolving 'dl.google.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome.list:3 and /etc/apt/sources.list.d/google.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome.list:3 and /etc/apt/sources.list.d/google.list:1
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/google-chrome.list:3 and /etc/apt/sources.list.d/google.list:1
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/google-chrome.list:3 and /etc/apt/sources.list.d/google.list:1
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/google-chrome.list:3 and /etc/apt/sources.list.d/google.list:1
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/google-chrome.list:3 and /etc/apt/sources.list.d/google.list:1

 

 

 

 

해결방법

 

1) $ vi /etc/network/interfaces 를 열고

 

dns-nameservers 8.8.8.8 8.8.4.4 를 추가.

 

2) $ vi /etc/resolv.conf 를 열고

 

nameserver 8.8.8.8

nameserver 8.8.4.4

를 추가

 

- 그리고 apt-get update 명령을 하면 오류가 나지 않고 정상적으로 처리되었다.