Hannah Montana Linux
Hannah Montana Linux is a GNU/Linux distribution themed after some TV show which was popular in the US in the early 2000s. There was only one intital release in 2008, there were no further releases. It was based on a now very old version of KUbuntu, Ubuntu's KDE-desktop flavoured spin. It had a distinct custom KDE theme and a purple icon pack. That's it, that's everything which seperated Hannah Montana Linux from the regular KUbuntu release.
Hanna Montana Linux features KDE Plasma 4.2, which is ancient. The icons are mostly KDEs Oxygen theme, popular at the time of Hannah Montana Linux's release, with about half the icons shaded pink or purple.
Hanna Montana Linux featured the KDE Plasma 4.2 desktop environment.
Making your own GNU/Linux distribution like Hannah Montana Linux
There's zero reason to install an ancient version of KUbuntu from 2008 with an outdated version of the KDE Plasma desktop just to get a Hanna Montana themed desktop. The better alternative is to simply download the icons and the theme and use that with a modern GNU/Linux distribution. The icons and wallpaper can be used on modern KDE version as well as other desktop environments such as XFCE4.
Xfce with icons and wallpaper from Hannah Montana Linux on Fedora 30.
Here's the icons:
Unpack the icons and place them in either
Getting the rest of a modern GNU/Linux distributions desktop Hannah Montana themed may be slightly more tricky. You can use the KDE 4.2 theme file from Hannah Montana Linux as a starting point:
That file has the following folders:
bootscreen kdm ksplash plasma wallpapers - it does not include the icons (download the icon file listed above separately).
The wallpapers can be used as is. Using the rest of the 10+ year old theme files is more tricky. You could make a custom a Plymouth theme which uses bootscreen/splash.png based on a simple theme like "script". The kdm display manager for KDE is discontinued, modern KDE uses SSDM so that theme can not be used on modern KDE without some modificaitons. The ksplash theme is still usable and so are the wallpapers. KDE Plasma changed quite a lot between KDE 4 and 5 but you could make the Plasma theme work with some effort. Good luck.
Hannah Montana Linux is still available for download at http://hannahmontana.sourceforge.net/ in case you want to try the full distribution.