Follow the steps in .

If the CD-ROM drive on the guest does not get mounted, as seen with some versions of Oracle Solaris 10, run the following command as root:

svcadm restart volfs

Change to the directory where your CD-ROM drive is mounted and run the following command as root:

pkgadd -G -d ./VBoxSolarisAdditions.pkg

Choose 1 and confirm installation of the Guest Additions package. After the installation is complete, log out and log in to X server on your guest, to activate the X11 Guest Additions.