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I want to configure proxy authentication in KDE. in proxy setting there are two choices available: Prompt as needed and Username/Password. but last one is disabled...

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up vote 3 down vote accepted

This is a long standing bug in KDE

The work around is to set a proxy manually, in ~/.bashrc

export http_proxy=http://<username>:<password>@<proxyIP>:<port>

You then have to use the -E with sudo

sudo -E apt-get update
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