I have installed iTunes 10 by wine on Ubuntu 12.10 and removed it. I installed iTunes 7 by playonlinux. When I trying to start the application, it shows iTunes library.itl cannot be read because it was created by a newer version.
How can I fix it?
Go to documents > Music (inside wine) and delete (or move) The iTunes folder.
I am writing this answer based on my windows experience. I have never tried installing itunes in ubuntu.