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I installed CentOS 7 with Gnome environment. I installed Cinnamon by following these instructions: How to install Desktop Environments on CentOS 7?

But if I run startx, I see I lost my app windows and switched to Cinnamon. If I log out, I get back my Gnome GUI.

They don't say how to replace completely Gnome by Cinnamon. (At the boot for example.)

  1. When I run startx, it creates a new session of my user, right?
  2. How to replace completely gnome by Cinnamon? Because if I need to run startx everytime, it will waste my resource since Gnome will be still running.
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    Actually you can change cinnamon as default GUI when you got login screen.You can click a login session. You can change it from login session and you can switch back to gnome too.I already tried mate and worked fine.I installed mate thru yum. – supriady Jul 22 '18 at 6:35
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First configure your system to start in graphical mode automatically. startx command is something from 20 years ago.

systemctl set-default graphical.target

Now what gets you confused is most likely the login manager. The default in CentOS7 is GDM which is part of gnome. But also Cinnamon is based on gnome 3 so it uses a lot of common libraries.

In GDM you can choose to start Cinnamon when you log in also you can configure to be your default desktop environment.

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