apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed
  cpp cpp-4.3 dbus fontconfig gconf2-common libatk1.0-0 libcairo2 libcups2 libdatrie0 libdbus-1-3 libdbus-glib-1-2 libdirectfb-1.0-0 libdrm2 libgconf2-4 libgl1-mesa-glx
  libglu1-mesa libgmp3c2 libgstreamer-plugins-base0.10-0 libgstreamer0.10-0 libgtk2.0-0 libgtk2.0-common libidl0 libjasper1 libmpfr1ldbl liborbit2 libpango1.0-0
  libpango1.0-common libpixman-1-0 libsysfs2 libthai-data libthai0 libts-0.0-0 libwxbase2.8-0 libwxgtk2.8-0 libxcb-render-util0 libxcb-render0 libxcomposite1 libxcursor1
  libxdamage1 libxfixes3 libxft2 libxi6 libxinerama1 libxrandr2 libxrender1 libxxf86vm1
The following packages will be upgraded:
  gnuplot-nox
1 upgraded, 46 newly installed, 0 to remove and 0 not upgraded.
Need to get 24.7MB of archives.
After this operation, 64.2MB of additional disk space will be used.
Do you want to continue [Y/n]? n
Abort.

apt, what exactly didn't you 'get' from the -nox part of gnuplot-nox? (It seems groff is the culprit here btw)