vim /etc/apt/apt.conf.d/99Proxy
Acquire {
http::Proxy "http://[username]:[password]@[proxyserver]:[portnumber]/";
https::Proxy "http://[username]:[password]@[proxyserver]:[portnumber]/";
};apt-key adv --keyserver hkp://[keyserver] --keyserver-options http-proxy=http://[username]:[password]@[proxyserver]:[portnumber]/ --recv 9DD9DCB49A3162033F368818C72E52529D44BD75git config --global http.proxy http://[username]:[password]@[proxyserver]:[portnumber]/export https_proxy=http://[username]:[password]@[proxyserver]:[portnumber]/snap set system proxy.http="http://[username]:[password]@[proxyserver]:[portnumber]/"vim /etc/wgetrc
https_proxy = http://[username]:[password]@[proxyserver]:[portnumber]/
http_proxy = http://[username]:[password]@[proxyserver]:[portnumber]/