No theme index file.dpkg error

While trying to upgrade to texmacs 1:1.0.7.2-1in Sid (unstable) on a machine running Debian Lenny (Stable), I was getting the following error

$sudo apt-get install texmacs
// bunch of apt-get messages

Setting up texmacs-common (1:1.0.7.2-1) ...
gtk-update-icon-cache: No theme index file.dpkg: error processing texmacs-common (--configure):
subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of texmacs:
texmacs depends on texmacs-common (= 1:1.0.7.2-1); however:
Package texmacs-common is not configured yet.
dpkg: error processing texmacs (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
texmacs-common
texmacs
E: Sub-process /usr/bin/dpkg returned an error code (1)


Install the gnome-icon-theme package to solve this bug.
$sudo apt-get install -t stable gnome-icon-theme
//bunch of apt-get messages

Selecting previously deselected package gnome-icon-theme.
(Reading database ... 225097 files and directories currently installed.)
Unpacking gnome-icon-theme (from .../gnome-icon-theme_2.22.0-1_all.deb) ...
Setting up texmacs-common (1:1.0.7.2-1) ...
gtk-update-icon-cache: Cache file created successfully.
Setting up texmacs (1:1.0.7.2-1) ...
Setting up gnome-icon-theme (2.22.0-1) ...