please run the following commands in a terminal:

sudo aptitude install libstdc++5

you can try if it works, but so far we experience several problems.

(November 2009) Just after release of 9.10 there is the needed package missing, so we get it from an older version (9.04).
please run the following commands in a terminal:

echo "deb http://us.archive.ubuntu.com/ubuntu/ jaunty universe" >> apt_source_dormBook.list

sudo cp apt_source_dormBook.list /etc/apt/sources.list.d/

rm apt_source_dormBook.list

sudo aptitude update

sudo aptitude install libstdc++5