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set system level proxy in Ubuntu

Mingmin

Edit /etc/profile, to add below lines:

export http_proxy="http://username:password@proxy-address:port"
export https_proxy="https://username:password@proxy-address:port"
export ftp_proxy="ftp://username:password@proxy-address:port"
export socks_proxy="socks://username:password@proxy-address:port"

Then run 'source /etc/profile'

[refer to http://askubuntu.com/questions/482126/system-wide-proxy-settings-when-on-a-windows-network-with-a-password]