Linux is invincible and incredibly responsive compared to Windows.
Linux Flash Developers can simply install Adobe FlexBuilder for Linux(alpha). *Flex Builder 3 for Linux alpha 5 was released on 11/24/2009
Here is details:
1，install eclipse in ubuntu 10.04 or other version
sudo apt-get install eclipse
2，install flex builder for linx alpha 5
download from http://labs.adobe.com/downloads/flexbuilder_linux.html
If you are running the install on a terminal, you can modify the default setup path to /usr/lib/ or /home/$usrname/app.
Other tutorials on how to install Flex Builder on Linux: