Unfortunately, I can't reproduce problem onmytestubuntu 11.04_86, so I can't detect an exact root cause..
One more idea, it can be related to /tmp folder that is used for internal needs.
Could you kindly check:
1) /tmp folderexists on your system;
2) your active account has read-write access to /tmp folder;
If everything is OK, please invoke install.sh. Incorrect case it should provide a menu like:
Please make your selection by entering an option.
Root access is recommended for evaluation.
1. Install as a root for system wide access for all users [default]
2. Install to root for system wide access for all users using sudo
privileges and password
3. Install as current user to limit access to user level
Please type a selection :