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It would appear that the postfix package has not been configured with an appropriate mailname (and hence /etc/mailname is not present). Please can you reconfigure postfix using the following command ensuring that you set a FQDN for the system mailname. sudo dpkg-reconfigure postfix Please update this bug report if this resolves your issue ** Changed in: amavisd-new (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to amavisd-new in Ubuntu. https://bugs.launchpad.net/bugs/749895 Title: package amavisd-new-postfix 1:2.6.4-1ubuntu6 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