sudo: Unable to resolve the host: reasons and solutions

• Modify hostname

hostnamectl set-hostname master
bash

 

• Reason: The ubuntu device name of the host is modified, and the hosts file is not configured later, causing linux to be unable to resolve to your host address

sudo: 无法解析主机：xxxxxx

 

• Solution: It can be solved by configuring the hosts file. The specific operations are as follows:

sudo vim /etc/hosts

 

• Modify the xxxx behind the number below to your current device name and save it.

127.0.1.1       xxxx