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My Ubuntu is within a virtual machine.

When I log in with a ubuntu session, the web browser works fine. But when I log in with a xfce session, the web browser does not work... I try to change proxy setting, it gives me:

When running Google Chrome under a supported desktop environment, the system proxy settings will be used. However, either your system is not supported or there was a problem launching your system configuration.

But you can still configure via the command line. Please see man google-chrome for more information on flags and environment variables.

Could anyone help?

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There's a command line option --proxy-server - so it should be possible to run chrome using a terminal window, using the command

google-chrome --proxy-server="<proxy-name>:<proxy-port>"

Another solution would be to set the environment variables:

export http_proxy
export https_proxy
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