The following article describes the options available to encrypt a dual-boot system.

PGP Whole Disk Encryption

The PGP Whole Disk Encryption feature is available for use on a dual-boot system as long as you boot to an operating system supported by PGP Whole Disk Encryption. The currently supported operating systems include Windows XP, Windows 2000, Windows Vista, Windows 7, Ubuntu and Redhat Linux.

See the following release notes for compatible Linux systems:

PGP Whole Disk Encryption for Linux 10.0.x and 10.1.x Release Notes

http://www.symantec.com/docs/DOC4154

PGP Whole Disk Encryption for Linux 10.2 Release Notes

http://www.symantec.com/docs/DOC4561

PGP Whole Disk Encryption for Linux 10.2.1 Release Notes

http://www.symantec.com/docs/DOC5543

PGP Whole Disk Encryption is only supported on dual-boot systems on a single hard disk. Performing encryption on two seperate hard disks is not supported.

PGP Desktop must be installed on both operating systems before encrypting the disk.

 

Partition Encryption

Be aware when using Partition mode encryption, this mode only supports dual-booting with another operating system (such as Linux) as long as you encrypt only the Windows partition. The unsupported operating system must be on separate non-encrypted partition.  If encrypting both OS partitions is desired, Full Disk encryption mode must be used instead of Partition mode.