Have been trying to install Ardour. After a couple of troublesum downloads, managed to get a file on my computer. Then I gt the message in my terminal:
Downloads$ bin/sh ./Ardour_64bit-4.2.0.run
bash: bin/sh: Datei oder Verzeichnis nicht gefunden
Looking at the error message I guess you are German? Here is an advice for installing Ardour in German language: http://wiki.ubuntuusers.de/ardour
Good luck