Linux proxy settings to complete the apt-get

Ubuntu server was recently closed its external network usage rights, but the installation of the software they need to connect to external networks, then it can only be connected through a proxy.
First Follow this post to set the proxy windows side.
 
Finally curl www.baidu.com to have printed.
 
But when I sudo apt-get update, the error still occurs
 
Unsupported proxy configured: 127.0.0.1://18088
 
Replace the temporary command:
 
sudo apt-get -o Acquire::http::proxy=" http://127.0.0.1:18088/" update
 
sudo apt-get -o Acquire::http::proxy=" http://127.0.0.1:18088/" install python3-pip
 
The results of a successful installation of the software

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Origin www.cnblogs.com/djw316/p/11493803.html