Can I convert Ubuntu into another form of Ubuntu like Kubuntu or Ubuntu Studio and the system recognize itself as the new form?
The main difference between main Ubuntu, XUbuntu, KUbuntu, and LUbuntu is the Desktop Environment. You can install one of these DEs onto your system with the following commands:
To remove any of these, run the command that you used to install but instead of
The autoremove command removes all the packages that were installed. The way these installs work is that there is one meta-package that just depends on every package that is required for that Desktop Environment. Thus the extra packages aren't removed when the meta package is, and you need to remove them with autoremove.
This will install the Desktop Environment and most programs for each of the flavors of Ubuntu, though sometimes there are programs that are not installed by this. An install switched by using these commands will not be the same as a clean install of the Ubuntu flavor, though it should be pretty close. There is also no limit as to having more then one of these Desktop Environments. I personally kept both ubuntu-desktop and ubuntu-gnome-desktop on my computer for a while just to compare.
I do not know about a changing to/from a Ubuntu Studio install, though I am pretty sure it isn't as easy as just changing the Desktop Environment.
You can also keep them all, and choose which one you want to log in to. That's a good way to compare, just switch every time you boot. Every file you're created will be in the same place, every application you installed for one flavor will be available in the others.