# use aptitude only if it's available
if [ -x /usr/bin/aptitude ] ; then
- APTINSTALL="aptitude -y --without-recommends install $DPKG_OPTIONS"
APTUPDATE='aptitude update'
- APTUPGRADE='aptitude -y safe-upgrade'
+ # Debian ISOs do not contain signed Release files
+ if [ -n "$ISO" ] ; then
+ APTINSTALL="aptitude -y --allow-untrusted --without-recommends install $DPKG_OPTIONS"
+ APTUPGRADE='aptitude -y --allow-untrusted safe-upgrade'
+ else
+ APTINSTALL="aptitude -y --without-recommends install $DPKG_OPTIONS"
+ APTUPGRADE='aptitude -y safe-upgrade'
+ fi
else
APTINSTALL="apt-get --force-yes -y --no-install-recommends install $DPKG_OPTIONS"
APTUPDATE='apt-get update'