Setting up postfix (2.8.7-1ubuntu2) ...
Adding group `postfix' (GID 125) ...
Done.
Adding system user `postfix' (UID 115) ...
Adding new user `postfix' (UID 115) 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 126) ...
Done.
setting myhostname: think.(null)
setting alias maps
setting alias database
changing /etc/mailname to think.frosty-geek.net
setting myorigin
setting destinations: think.frosty-geek.net, think.(null), localhost.(null), localhost
setting relayhost: 
setting mynetworks: 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
setting mailbox_size_limit: 0
setting recipient_delimiter: +
setting inet_interfaces: loopback-only
setting default_transport: error
setting relay_transport: error
/etc/aliases does not exist, creating it.
WARNING: /etc/aliases exists, but does not have a root alias.

Postfix is now set up with a default configuration.  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'.

Running newaliases
newaliases: warning: valid_hostname: invalid character 40(decimal): think.(null)
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad parameter value: think.(null)
dpkg: error processing postfix (--configure):
 subprocess installed post-installation script returned error exit status 75