All efforts to change the Update Manager's proxy come to a grinding halt without any solution. The reason for this fallout is that the proxy is "hidden" at a very safe location. Ubuntu Update Manager's proxy does not change after changing the system-wide proxy or proxy of synaptic program. The reason is that it uses the apt-get's proxy settings. Which can be amended by looking at the /etc/apt/apt.conf file. This file contains the information about proxy servers.
Acquire::http::proxy "http://ProxyServerAddress:ProxyServerPort/";
Acquire::ftp::proxy "ftp://ProxyServerAddress: ProxyServerPort/";
This information can be amended to gain direct access to the internet or if the need is to change to a different proxy server.
