Parallels Desktop 6.0 f/ Mac, 250-999u, EDU, FR PDFM6XL-A04-FR User Manual

Note: In Linux virtual machines, X Server may fail to start after the upgrade, which means that 
you may need to upgrade Parallels Tools manually in text mode. 

If you encounter any problems during the upgrade, visit the upgrade troubleshooting page or use 
the online Troubleshooting guide available through Help > Troubleshooting Guide.