How i can install KDE?

Support Installation and Configuration
1

Updated the system, try install parrot-desktop-kde, broken package.

Parrotsec 6

2

I was able to install KDE Plasma using something like:

sudo apt install parrot-desktop-kde -t parrot6-backports

However I noted some tools missing after this so I reinstalled them from some of the tool meta-packages.

Hope this helps!