Check your apt settings
grep -Hnri proxy /etc/apt/
will list out the current proxy settings used by apt in the following format.
filename:linenumber:proxy-setting
If you see any output, it corresponds to apt's proxy settings. They will have to be cleared.
sudoedit <filename>
will allow you to edit the corresponding configuration file. Copy the existing contents somewhere in case you need to restore them, and delete or comment the lines that look like
Acquire::<protocol>::proxy=<your proxy here>
(Add // at the beginning of a line to comment that line. Commented lines are ignored.)
Save the files, close the text editor, and retry. If the problem persists,
Check global default environment.
grep proxy -i /etc/environment
Should list any proxy settings that are applied globally. If you need to clear them,
sudoedit /etc/environment
will fire up the text editor. Lines that start with # will be ignored, so add a # before those lines that mention your proxy settings. Save the file and retry.
Cleaning the user environment
It is possible that the systemwide configuration is clean but apt is picking up proxy settings from the user's environment. sudoin certain configurations by default, or when explicitly passed -E as an option, preserves the environment.
env | grep -i proxy
should list out any current environment proxy settings. unset <variable> can be used to unset or clear a variable. Unset all <protocol>_proxy variables. If they are automatically being set, you might comment out the corresponding entries from ~/.profile, ~/.bashrc, ~/.pam_environment
(Those are the most common files that contain the entries. All of them can be searched at once using grep -Hni proxy ~/.profile ~/.bashrc ~/.pam_environment )
To Arin , thanks for making me crazy
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how to reset proxy on command line on ubuntu 12.04
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