After upgrading some load balancers to Debian Wheezy I noticed this error (happens when dpkg-reconfigure ipvsadm) is ran:
lb1:~# dpkg-reconfigure ipvsadm debconf: Unknown template field '__choices', in stanza #1 of /var/lib/dpkg/info/ipvsadm.templates debconf: Unknown template field '_description', in stanza #1 of /var/lib/dpkg/info/ipvsadm.templates debconf: Unknown template field '_description', in stanza #2 of /var/lib/dpkg/info/ipvsadm.templates debconf: Unknown template field '_description', in stanza #3 of /var/lib/dpkg/info/ipvsadm.templates debconf: Unknown template field '_description', in stanza #4 of /var/lib/dpkg/info/ipvsadm.templates ....
If you encounter this error you can run this sed command to fix up the template:
sed -i -r 's/^_+//' /var/lib/dpkg/info/ipvsadm.templates