Comment 26 for bug 91399

I'm get the same problem here when upgrading from feisty to gutsy on my laptop. The output with DEBCONF_DEBUG=developer looks something like this: (I'm going to quickly type it over)

<apt get out stuff ....>
Setting up console-setup (1.16ubuntu5) ...
debconf (developer): frontend started
debconf (developer): frontend running, package name is console-setup
debconf (developer): starting /var/lib/dpkg/info/console-setup.config configure 1.13ubuntu8
debconf (developer): <-- DEBIAN_HAS_FRONTEND: 1
debconf (developer): <-- CAPB backup
debconf (developer): --> 0 multiselect escape backup
dpkg: error processing console-set (--configure):
 subprocess post-installation script returned error exit status 20
dpkg: dependency problems prevent configuration of ubuntu-minimal:
  ubuntu-minimal depends on console-setup; however:
   Package console-setup is not configured yet.
 dpkg: error processing ubuntu-minimal (--configure):
  dependency problems - leaving unconfigured
 Errors were encountered while processing:
  console-setup
  ubuntu-minimal