Ubuntu System-Wide Proxy Auto-Configuration (PAC) script

Solution 1:

apt-get install

doesn't do any installation , the correct syntax is:

apt-get install package_name

But did you see the output of that program in terminal ?

And setting proxy in firefox won't affect a global proxy settings , you may need to refer to Network Manager in Ubuntu.

@update:

the whole progress will be involved , e.g when install mscorettf-installer with wget

%> cat /etc/apt/apt.conf.d/00proxy 
Acquire {
    Retries "0";
    HTTP {
        Proxy "http://221.176.168.178:80";
    };
};