ubuntu 为 apt 设置 http 代理

例如：

HTTP(S) 代理服务器：127.0.0.1:54483
SOCKS 代理服务器：127.0.0.1:66161

用 sudo 修改 /etc/apt/apt.conf 文件：

zds@ubuntu:~$ sudo vim /etc/apt/apt.conf
zds@ubuntu:~$ nl /etc/apt/apt.conf
     1  Acquire::http::proxy "http://127.0.0.1:54483/";
     2  Acquire::https::proxy "https://127.0.0.1:54483/";
     3  Acquire::ftp::proxy "ftp://127.0.0.1:54483/";
     4  Acquire::socks::proxy "socks://127.0.0.1:66161";