We install Gnome on our Xfce desktop.
Remember to login with Gnome Xorg if you are working on VirtualBox.
We install specific Gnome packages.
If you have an error in our ArcoLinux Tweak Tool or ATT you start the tool from the terminal.
Pacman will/might give a clue why the installation has failed.
There are so many reasons why it can go wrong. Analysis is then required.
Packages not present, conflicting packages, Arch Linux server down, ArcoLinux server down, key issues,...
Removing the desktop can be achieved by removing the most important packages.
It is not always possible for example with Plasma. Then you do a clean install.
You can use our cheatsheet to know what packages to remove
sudo pacman -R ... sudo pacman -Rs ...