This isn't a bug in the package, but a consequence of you having manually created the clamav user. What you need to do is remove (deluser) the clamav user you manually created and then retry the installation. I'm turning this into a support request so you can get help with how to do that.
** Changed in: clamav (Ubuntu) Status: New => Invalid ** Converted to question: https://answers.launchpad.net/ubuntu/+source/clamav/+question/145912 -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to clamav in ubuntu. https://bugs.launchpad.net/bugs/721420 Title: package clamav-base 0.96.5 dfsg-1ubuntu1.10.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs