Installing Adobe Air on 64bit GNU/Linux
Unfortunately Adobe Air which is no longer supported for GNU/Linux, however many applications will still work using version 2.6 of Adobe Air which was the last version available for Linux and can still be downloaded from the archive, or directly from here.
If you're running a 64bit distro, which most people these days are, then the installation process will be rather complicated (for example I completely broke Gnome trying to get it working! hopefully these instructions will help you avoid such issues). Here's a list of the problems I've come across during installation on various 64bit GNU/Linux systems.
execvp: permission denied
If you get an error message saying execvp: permission denied, it most likely means that your /tmp directory is on a temporary filesystem which doesn't allow executable permissions. To fix this you can comment out the line in your /etc/fstab which mounts /tmp onto a tmpfs and reboot and it will then be part of the normal filesystem. You can uncomment this and reboot again after installation of Adobe Air is complete.
Next after trying to run the Air installer again you may encounter a number of errors saying that various libraries are not found, even though you have them installed, such as libgtk2.0-0, but the problem is, it's looking for the 32bit version of these things. The easiest way to satisfy all these 32bit dependencies is to use Multiarch and add the i386 architecture, and then install the missing package and maybe some required dependencies, specifying the i386 architecture for each.
sudo dpkg --add-architecture i386 sudo apt-get update sudo apt-get install libgtk2.0-0:i386
There may be a number of messages about needing to apt-get -f install to resolve dependency issues which you can just do as needed. After you have all these installed, you can then attempt to run the installer again.
Missing gnome-keyring or KWallet
Eventually you should get a window come up with an agreement to agree to which looks positive, but you are then likely to get an error saying that the gnome-keyring or KWallet is needed to continue. This time it's not that it's looking for the i386 version, but rather that it's looking in the wrong place. This can usually be fixed by locating it and creating a symlink into the base of /usr/lib where Air will spot it. Here's an example of finding and linking it:
$ locate libgnome-keyring.so /usr/lib/x86_64-linux-gnu/libgnome-keyring.so.0 /usr/lib/x86_64-linux-gnu/libgnome-keyring.so.0.2.0 $ sudo ln -s /usr/lib/x86_64-linux-gnu/libgnome-keyring.so.0 /usr/lib