Originally Posted by phantom_cyph

Well, Ubuntu is the same as Kubuntu with a different desktop environment. Except, if you install the full version of either, you're looking at a 7.45 Gigabyte install. If you do it minimal and add the kubuntu desktop, you have a 2.5 gigabyte install. See the difference?

Originally Posted by Simon Bridge

You haven't actually specified a problem... but yeah, chances are I have. All you've told me is
You should start another thread - post the link to that thread here so I can find it. In that thread, state what it is you have done, what you expect to happen as a result, and what did happen.

Reading between the lines - you have installed gentoo linux (guessing from context) from an unspecified source, in an unspecified manner, without errors (worth mentioning), warnings or noticeable issues, in a dual-boot configuration (unspecified), on unspecified architecture. The boot process occurs normally - for the other OS.

Sounds like you have not configured the system bootloader for dual-boot.

I can go into detail in the other thread.