[dijichi2]

sudo apt-get install fetchmail # this is needed anyway, seems to be only thing missing with default feisty install

then either:

1) edit /etc/lsb-release
change
DISTRIB_RELEASE=7.04
to
DISTRIB_RELEASE=6

or

2)
edit util/utilfunc.sh
change
if [ $PLATFORM = "DEBIAN3.1" -o $PLATFORM = "UBUNTU6" ]; then
to
if [ $PLATFORM = "DEBIAN3.1" -o $PLATFORM = "UBUNTU6" -o $PLATFORM = "UBUNTUUNKNOWN" ]; then

change
if [ $PLATFORM = "UBUNTU6" ]; then
to
if [ $PLATFORM = "UBUNTU6" -o $PLATFORM = "UBUNTUUNKNOWN" ]; then

edit
util/modules/platform.sh
change
if [ $PLATFORM = "DEBIAN3.1" -o $PLATFORM = "MANDRIVA2006" -o $PLATFORM = "UBUNTU6" ]; then
to
if [ $PLATFORM = "DEBIAN3.1" -o $PLATFORM = "MANDRIVA2006" -o $PLATFORM = "UBUNTU6" -o $PLATFORM = "UBUNTUUNKNOWN" ]; then

they both do pretty much same thing so 1) is easier, just change it back when install finished.

As usual, this is not recommended for production servers! YMMV.