apt-get update異常處理

1. 問題描述

系統環境：Ubuntu 18.04.3 LTS

執行apt-get update更新時遇到如下狀況

錯誤訊息：

Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease

  Could not resolve 'security.ubuntu.com'

Err:2 http://tw.archive.ubuntu.com/ubuntu bionic InRelease               

  Could not resolve 'tw.archive.ubuntu.com'

Err:3 http://packages.ros.org/ros/ubuntu bionic InRelease                

  Could not resolve 'packages.ros.org'

Err:4 http://tw.archive.ubuntu.com/ubuntu bionic-updates InRelease

  Could not resolve 'tw.archive.ubuntu.com'

Err:5 http://tw.archive.ubuntu.com/ubuntu bionic-backports InRelease

  Could not resolve 'tw.archive.ubuntu.com'

Reading package lists... Done

W: Failed to fetch http://tw.archive.ubuntu.com/ubuntu/dists/bionic/InRelease  Could not resolve 'tw.archive.ubuntu.com'

W: Failed to fetch http://tw.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Could not resolve 'tw.archive.ubuntu.com'

W: Failed to fetch http://tw.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  Could not resolve 'tw.archive.ubuntu.com'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  Could not resolve 'security.ubuntu.com'

W: Failed to fetch http://packages.ros.org/ros/ubuntu/dists/bionic/InRelease  Could not resolve 'packages.ros.org'

W: Some index files failed to download. They have been ignored, or old ones used instead.

2. 解決方法

Linux Force DHCP client (dhclient) to renew ip address

Linux renew ip command

$ sudo dhclient -r //release ip 釋出IP

$ sudo dhclient //獲取IP

Now obtain fresh IP:

$ sudo dhclient

$ sudo ifdown eth0

$ sudo ifup eth0

$ sudo /etc/init.d/network restart

OR

$ sudo /etc/init.d/networking restart

參考資料

1. apt-get update 异常 Temporary failure resolving

2. Linux Force DHCP Client (dhclient) to Renew IP Address