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My ubuntu version is 12.04.

I have installed clamav as root user using the below commands.

apt-get install clamav
apt-get install clamav-daemon

But when I use the below command

clamd PING

It gives below error message.

ERROR: initgroups() failed

Am I missed anything?

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I think you are already running clamd process. –  devav2 Sep 24 '12 at 9:51
If you are wanting to start/stop clamd (which is how I came to be looking here..), you need to do the following: sudo service clamav-daemon stop To start it again do sudo service clamav-daemon start –  drevicko Sep 29 '12 at 11:26

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