I have installed the 18.04 LTS server version. I did different commands like:
tar -xzf xxxx.tar.gz xxxx/ (without GUI) hadfs dfs -put input /input (with GUI)
I did other commands which work with folder too.
However, after this, I installed a GUI using:
sudo apt install tasksel sudo tasksel install ubuntu-desktop
However, with the GUI installed and using the terminal, some of these commands which work with folder 'change' and maybe I do not need to put the initial or final slash or put it.
My doubt is: why sometimes without the GUI that command is correct and with the GUI the use of the slash change? Maybe is because the GUI that I installed? Or is it a basic noob fail because of my lack of knowledge with Linux systems?