wget http://www.icerts.com/images/logo.jpg --header "Referer: www.icerts.com"
--2018-03-16 16:41:28-- http://www.icerts.com/images/logo.jpg
Resolving www.icerts.com (www.icerts.com)... 192.243.111.11
Connecting to www.icerts.com (www.icerts.com)|192.243.111.11|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://www.icerts.com/images/logo.jpg [following]
--2018-03-16 16:41:30-- https://www.icerts.com/images/logo.jpg
Connecting to www.icerts.com (www.icerts.com)|192.243.111.11|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2018-03-16 16:41:32 ERROR 404: Not Found.
也无法使用sudo apt-get install安装任何软件，它始终显示相同的ERROR 404：Not Found