How to unstall MySQL 5.1 on Ubuntu 8.04 LTS

[Manasi Save]

Dear All,
 
I need to install MySQL 5.1.42 on ubuntu. MySQL site does not have installer packages for ubuntu(.deb). 
If I need to use tar.gz is there any document available which will help me do this specific changes.
 
Any input will be great help. As I need to set it up urgently.
 
Thanks in advance.

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Regards,
Manasi Save
Database Administrator