xvm-mail-config failed to configure on t-i

Got the following, _despite_ being asked for my mailname in the configuration step.

Setting up postfix (2.5.1-2ubuntu1.4) ...
Adding group `postfix' (GID 114) ...
Done.
Adding system user `postfix' (UID 108) ...
Adding new user `postfix' (UID 108) with group `postfix' ...
Not creating home directory `/var/spool/postfix'.
Creating /etc/postfix/dynamicmaps.cf
Adding tcp map entry to /etc/postfix/dynamicmaps.cf
Adding group `postdrop' (GID 115) ...
Done.
/etc/aliases does not exist, creating it.

Postfix was not set up. Start with
  cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
. If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed. To view Postfix configuration
values, see postconf(1).

After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.

Setting up procmail (3.22-16ubuntu3) ...
Setting up xvm-mail-config (0.0.11) ...
Adding `diversion of /etc/postfix/main.cf to /etc/postfix/main.cf.xvm-orig by xvm-mail-config'
Adding `diversion of /etc/aliases to /etc/aliases.xvm-orig by xvm-mail-config'
newaliases: fatal: /etc/mailname: cannot open file: No such file or directory
dpkg: error processing xvm-mail-config (--configure):
 subprocess post-installation script returned error exit status 75