Regd. How to install iTunes on Ubuntu operating system , pls help

There is no version of iTunes for any Linux system. Some people have had partial success using the Windows version of iTunes in one of the emulators such as WINE, but it's not supported and from what I've read not fully functional. Perhaps you can find help on one of the Ubuntu forums.

Regards.

https://www.google.dk/search?q=linux+get+wine+to+run+itunes&oq=linux+get+wine+to +run+itunes&aqs=chrome..69i57.5368j0j8&sourceid=chrome&es_sm=93&ie=UTF-8

itune store not sported in this