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This is explaining step to step how to install opensolaris in your pc that there are  ubuntu there.

Preparing and Backing Up Your Hard Drive

Keeping a hard drive backup protects you in case of system failure. It is thus important to back up your hard drive regularly, especially when adjusting partitions.

Check Your Disk for Errors

Every thirty times that you restart your computer, Ubuntu runs a file system check to make sure that your hard drive is working consistently. Use the fsck command to check your hard drive before installing OpenSolaris.

1. Click on the Applications button from the taskbar, click Accessories, and open Terminal.
   The Terminal window opens.
   
2. Sign in for administrator privileges.
   $ sudo
   
At the prompt, enter your password.

For the remainder of this session, you are designated as an administrator.

4. Run the fsck function.
   # fsck
   A warning appears, asking you to confirm the fsck command
   
5. Confirm the fsck command.
   ? y
   The computer runs the fsck command. This takes between a couple of seconds and a couple of hours.
   
6. Close the Terminal window and restart your computer.
   

Download g4u Backup Software and Create a Bootable CD

1. Go to http://fbim.fh-regensburg.de/~feyrer/g4u/ and download an ISO image file of the g4u program.
   The ISO file is only about three megabytes large.
   
2. Place a blank CD in the optical drive, and open CD/DVD Creator.
   Click Places on the taskbar and select CD/DVD Creator.
   
3. Drag the g4u ISO image onto the CD/DVD Creator's white box.
   A file icon appears in the white space.
   
4. Click Write to Disc, to the above right of the white box.
   A window detailing possible actions appears.
   
5. Click Create From Image.
   Further writing options are presented in a new window.
   
6. Click Write.
   After a minute or two, the disk is complete.
   

Option 1: Copy the Primary Drive to the External Drive.

This process describes how to copy a disk to an external drive. Go to Option 2 to copy a disk to an FTP server.

1. 
   
   Insert the g4u CD and boot the primary computer.
   
   The machine loads a kernel from the CD and prints assorted information to the screen. Upon completion of this process, a shell prompt and a list of commands appears.
   
   
   
2. Examine the computer's available hard drives with the disks command.
   
   
   g4u> disks
   
   Look for disk names like wd0, wd1, or sd0.
   
   
   
3. Identify both the primary drive and the external drive.
   Write down this information.
   
4. Copy the primary drive to the external drive with the copydisk command. The primary drive is listed first, and the external drive is listed second. Here is an example:
   g4u> copydisk wd0 wd1
   
5. Verify the backup.
   Test the external drive to ensure that the backup successfully loaded.
   

Option 2: Copy the Primary Drive to an FTP Server

Set Up an FTP Server

1. Create an FTP account named install on a server with enough space to store an image file of the primary system's hard drive.
   This is the destination for your backup file, so write down this address.
   
2. Verify that the primary system can log in to the FTP server via the install account.
   

Copy the Primary Drive to the FTP Server

1. 
   
   Insert the g4u CD and boot the primary computer.
   
   The machine loads a kernel from the CD and prints assorted information to the screen. Upon completion of this process, a shell prompt and a list of possible commands appears.
   
   
   
2. Examine the computer's available hard drives with the disks command.
   

g4u> disks

Look for disk names like wd0, wd1, or sd0.
2. Upload the primary machine's hard drive to the FTP server with the uploaddisk command, the address of your FTP server, and an end file name ending with .gz. Here is an example:
   
   
   g4u> uploaddisk your.ftp.server.com computerbackup.gz
   
   
   
3. Verify the backup.
   Log in to the FTP server to ensure that the backup successfully loaded.
   

Source From : Opensolaris