Air Dependency

Flex SDK is best installed using the SDK Installer, which requires Adobe AIR 2.6. If you didn't already know, installing Adobe AIR on Linux isn't that easy, as it is not supported by Adobe anymore. The easiest way I have found is this one:

1. If you're using a 64-bit Linux system, install the ia32-libs (AIR is 32-bit only):

   sudo apt-get install ia32-libs
   

   
   
2. Go here (http://update.devolo.com/linux/apt/pool/main/a/adobeair/) and download the AIR installer for 64-bit systems (amd64) or 32-bit (i386)
   
   
3. Install the package you just downloaded:

   sudo dpkg -i adobeair_2.6.0.19170_amd64.deb
   

You're done with the installation of Adobe AIR.

Installing the SDK Installer

1. Download the installer (.deb) here: http://flex.apache.org/installer.html
   
   
2. Once you have downloaded the .deb, install it using dpkg (this command will force the installation, even if the AIR dependency is not resolved):

   sudo dpkg -i --force-depends apache-flex-sdk-installer-2.6.0-bin.deb
   

   
   
3. Once the installer has been installed (you might encounter several warnings and errors, just ignored them), open a terminal and go the installation folder:

   cd "/opt/Apache Flex/Apache Flex SDK Installer/bin"
   

   
   
4. Run the installer:

   ./Apache\ Flex\ SDK\ Installer
   

Now you just need to decide where you want the SDK to be installed, and you're good. Everything should go smoothly.

Updating the SDK Installer