Why does not Ubuntu have a common CD to install Ubuntu, choosing at time of installation whether to install 32 bit or 64 bit Ubuntu, Like Windows disks. Is there any tweak that would allow installation of 32 bit Ubuntu and 64 bit Ubuntu from same CD?
Not to my knowledge, but maybe someone else can tell you if one exists. It is usually expected that the user will know the target platform and download the appropriate DVD. Having 2 DVDs has never been a cause of concern for me.
I stand corrected. Had a look around after reading the comments above and you can use multicd on Linux.http://multicd.tuxfamily.org looks good, I'm going to try it out myself.