I recently switched to Fedora KDE, but a few things about Plasma bother me. Can I install GNOME alongside it and switch back if I don't like it, or is that likely to break something?
Can I try GNOME on Fedora KDE without reinstalling?
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Yes, you can install GNOME alongside Plasma without reinstalling Fedora. Once it's installed, log out and choose the GNOME session on the login screen before signing back in. The session selector is often a little gear icon.
Plasma should still be available there, so you can switch back later. Just make sure you have enough disk space for the additional packages.
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Usually pretty safe, but not totally consequence free. Desktop environments can share settings under your home directory, so switching between KDE and GNOME may leave some visual preferences looking different. You'll also have more applications and configuration files around.
That sort of mess is different from breaking Fedora itself. Still, pay attention to what the package manager wants to install or remove rather than approving a big change blindly.
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The distro and hardware can affect how smoothly a different desktop runs, so there's no guarantee every feature will behave identically. Trying another session is a reasonable way to find out whether the things bothering you are specific to Plasma.
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Jexmar+9h:
If you don't see the session selector right away, check the login screen after selecting your user account.