Although not officially supported by Adobe, ColdFusion 8 can be successfully installed and run on Ubuntu.
The following can be used for installing ColdFusion on Ubuntu 10.04 (32 bit):
Make sure that Apache (sudo apt-get install apache2) and and libc6-i686 are installed (sudo apt-get install libc6-i686).
Specify the following:
Apache Configuration Directory: /etc/apache2
Apache Binary File: /usr/sbin/apache2
Apache Control File: /etc/init.d/apache2
sudo /etc/init.d/apache2 restart