Change screen resolution of Ubuntu 12.10 on Parallels 7

When I installed Ubuntu 12.10 using Parallel 7 and installed the Parallels Tools, it seems that the screen resolution is fixed to 800 x 600 pixels only. Gladly that there is a workaround for this problem. It is by using the Parallels Tools from Parallels 8. Credit to the post here: http://forum.parallels.com/showpost.php?p=657046&postcount=53 The steps are as follows:

1. Download the trial version of Parallels 8.
2. Mount the dmg file of Parallels 8.
3. Open terminal, go to the mounted dmg, for example in my system I did like this:

   $ cd /Volumes/Parallels\ Desktop\ 8/

4. Copy the iso file of the Parallel Tools to my home directory (or any directory), example:

   $ cp ./Parallels\ Desktop.app/Contents/Resources/Tools/prl-tools-lin.iso ~/

5. Mount the iso from the Ubuntu 12.10, and upgrade the Parallels Tools from Ubuntu 12.10 terminal, example:

   $ cd /media/{your-Ubuntu-user}/Parallels\ Tools $ sudo ./install

That's all :)