如何判断Ubuntu 16.04LTS系统是否安装Gnome或KDE桌面环境？

Hey there! Let's go over some super straightforward ways to figure out if you've got GNOME or KDE desktop environment installed on your Ubuntu 16.04 LTS system—no confusing, overly technical hoops to jump through.

1. Check Your Currently Running Desktop Environment (Easiest!) #

If you're logged in right now, you can get this info in two simple ways:

• Terminal command: Open up a terminal (Ctrl+Alt+T) and run this line:
  echo $XDG_CURRENT_DESKTOP
  You'll see output like GNOME if you're on GNOME, or KDE if you're using KDE.
• Graphical check: Head to your system settings. For GNOME, go to Settings > Details—you'll see "GNOME" listed under "Desktop Environment". For KDE, open System Settings > About This Computer and look for "Plasma" or "KDE Plasma" in the details.

2. Verify Installed Desktop Packages #

If you want to confirm whether the desktop environment is installed (even if you're not using it right now), use your package manager:

• Check for GNOME: Run this command in terminal to look for the core GNOME package:
  dpkg -l | grep gnome-core
  If you see lines starting with ii, that means GNOME core is installed.
• Check for KDE: Similarly, run this to look for KDE Plasma's core package:
  dpkg -l | grep kde-plasma-desktop
  Again, lines with ii indicate the package is installed.

3. Check the Login Screen Options #

This is another totally visual way—no terminal needed:

1. Log out of your current session (or restart your computer).
2. On the login screen, click the small gear icon next to your username.
3. You'll see a list of all available desktop environments. If you spot "GNOME" or "GNOME Classic", GNOME is installed. If "Plasma" or "KDE Plasma" is there, KDE is on your system.

内容的提问来源于stack exchange，提问作者Duchamp Gérard H. E.