The commands I used in terminal
1. We need to mount the pro-tools-lin.iso
$ cd media # get to the media directory
$ sudo mkdir cdrom # need a mount point
$ sudo mount /dev/cdrom /media/cdrom #barks about write protected and mounts as read-only
$ cd cdrom # go to the mount point
$ ls # see what we can see oh boy! An install file
$ sudo ./install
2. follow the instructions
3. reboot - I shutdown the machine, closed parallels, started parallels, started the vm (I'm running Kubuntu 12.04 LTS)
And no mouse pointer ... I'm running Parallels Build 7.0.15055 (Revision 740667; March 5, 2012)
Let me try the ISO download link.