This question already has an answer here:
I come from windows 7, and after 8 hours using Ubuntu everything went berserk.
I wanted to uninstall Python3 so I used sudo apt-get purge python3 and that opened the gates of hell.
It removed almost everything on my hard drive, now I have a Ubuntu desktop without even a terminal or the unity launcher, and I can't boot from the USB flash drive that I used to install Ubuntu. Currently in the process of formatting my computer and reinstalling Windows 7 as I lost almost all faith in Ubuntu and Linux in general. If something as trivial as removing a program runs the risk of destroying the operating system along with most of what's installed on my drive then I don't have no business using the OS.
The command I entered: sudo apt-get purge python3
Ubuntu version: 16.04 LTS
PS: this wasn't the main Python version that came with Ubuntu, but one that I installed and then decided to replace with 3.6.3
Can anyone explain why that happened?
Edit: I have used both mint and Manjaro since I posted this thread, and I'm a Linux guy now.. I have a Windows 7/ Manjaro dual boot setting and most (like 85%) of my time using a computer is on Linux. It turns out Ubuntu isn't for me, but happily there are dozens of other options to choose from.