As said in Parrot Blog
If you have a previous version of Parrot and want to upgrade the system, follow these steps:
Open a terminal window and type the following commands
sudo apt update sudo apt update sudo apt purge tomoyo-tools sudo apt full-upgrade sudo apt autoremove
OK, as far as I know and according to the Tomyo Documentations :
Tomoyo Linux is a Mandatory Access Control (MAC) implementation for Linux, used for system-analysis as well as system restriction for increased security. It is not designed to offer protection “out of the box”, but instead requires time and an understanding of the concepts and tools involved.
Focusing on the behavior of the system, where every process has its defined purpose, Tomoyo allows each process to declare the characteristic behavior and the resources it needs to achieve said purpose. With the protection enabled, Tomoyo then restricts each process to that set of behaviors and resources allowed by the administrator.
The main features of TOMOYO Linux include: * System analysis * Increased security through Mandatory Access Control * Tools to aid in policy generation * Simple syntax * Easy to use * Very few dependencies * Requires no modification of existing binaries
So, Why we have to purge and remove such tool from thee system while it is useful ?