Bug#683097: cdimage.debian.org: Cannot install weekly build of Debian Wheezy: "aptitude" missing from /usr/bin/debconf-apt-progress

[Rox64 <mrox128@gmail.com>]

Package: cdimage.debian.org
Severity: grave
Justification: renders package unusable

Hi guys, I have downloaded the latest AMD64 weekly build of Debian Wheezy from http://cdimage.debian.org/cdimage/weekly-builds/. After using "dd if=[name of iso]
of=[USB] oflag=direct bs=1048576", the USB booted flawlessly. When the installer asks for security updates, I checked "yes", but then the installer hangs when
it tries to download packages. I typed Alt+F4 and I see the following error messages:

Jul 28 17:43:40 pkgsel: checking for (security) updates to the base system
Jul 28 17:43:40 in-target: Can't exec "aptitude": No existe el fichero o el directorio at /usr/bin/debconf-apt/progress line 130, <STDIN> line 2.
Jul 28 17:43:40 in-target: Use of uninitialized value in vec at /usr/bin/debconf-apt-progress line 274, <STDIN> line 2.
Jul 28 17:43:40 in-target: Use of uninitialized value in vec at /usr/bin/debconf-apt-progress line 275, <STDIN> line 2.

Thank your for your assistance.

-- System Information:
Debian Release: wheezy/sid
  APT prefers oneiric-updates
  APT policy: (500, 'oneiric-updates'), (500, 'oneiric-security'), (500, 'oneiric'), (100, 'oneiric-backports')
Architecture: i386 (i686)

Kernel: Linux 3.0.0-21-generic (SMP w/2 CPU cores)
Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash