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I've been trying to follow these instructions, so that I could get the Citadel mail server to work alongside Apache, but I get an error when I try to restart Apache:

Invalid command 'ProxyPass', ...

I was told in the Apache docs that this is from the mod_proxy module, but apt-get install mod_proxy gives E: Couldn't find package mod_proxy, and I was unable to find it on the big list on the Apache site. What do I need to do to get the ProxyPass working in Ubuntu 10.04 TLS?

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up vote 57 down vote accepted

In the end I guessed that the module proxy_http in the mods-enabled directory might work, and used the command:

a2enmod proxy_http

My Proxy statements work now.

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