To start you can create a disk image using the partimage utility in a command line interface. After this I imagine you would be able to boot the newly create iso with VMware.
If you are using Ubuntu 12.04 or even 11.04, Partimage should be available from the Ubuntu software center. This installation method will allow you to easily search and install your selected software.
Step 1. Open the Ubuntu Software Center and locate the search bar in the top right hand corner of the window. Type "partimage" in the search bar then press enter. The partimage software package will be the first to display. Also returned from this search are partclone (utility to clone and restore a partition), partimage-server (use partimage across a network), and partimage-doc (partition image user documentation). You will want to click install and let the software center install the package for you.
Step 2. Open Terminal and enter the following command " sudo partimage", then enter your password and press enter.
Step 3. After entering your password the Partimage application should display in the Terminal window.
Step 4. Understanding the available options.
* Partition to save/restore - A list of all available partitions on all drives able to be backed up from or restored to. You may only choose to operate on one partition at a time.
* Image file to create/use - If creating a new image file enter the path and file name where the created back up will be written. If using an image file to restore a partition or drive enter the path to the mounted drive where the file is located.
Action to be done:
(*) Save partition into a new image file - Choosing this option will tell Partition Image to create a backup .img file from the partition selected in "Partition to save/restore", and write the file to the path entered in "Image file to create/use."
( ) Restore partition from an image file - This option will write the image file from the path entered under "Image file to create/use", and write it to the partition and/or drive selected under "Partition to save/restore."
( ) Restore an MBR from the image file - This will restore the MBR to the drive selected under "Partition to save/restore" to the image file contained in the path under "Image file to create/use."
[ ] Connect to server - This option will allow you to connect to a remote server to read or write an image file.
Step 5. This screen is fairly self explanatory. You will first want to select the desired compression level if any. You may also change how the image will be split during the writing process. The default mode is to create a 2Gb files. The final option gives Part Image instructions on what to do if it finishes the job succesfully. Choose which ever option is most appropriate for your situation.