The computer has to get data via a proxy server from the Internet in order to import software updates. However, no connection can be established, because the system does not know that it should use a proxy, which username, password and port number are to use.
Create a configuration file
# touch /etc/apt/apt.conf
Contents of file
Acquire::http::Proxy "http://proxyusername:proxypassword[at]123.123.123.123:3128/";
| proxyusername | = | name of the user wchich may use proxy |
| proxypassword | = | the users password |
| [at] | = | @ |
| 123.123.123.123 | = | ip-address of proxy |
| 3128 | = | Portnumber of proxy, this one belongs to squid |
# apt-get update
# apt-get upgrade
Both commands in one line
# apt-get update && apt-get upgrade