Trying to install "gnome-shell-system-monitor-applet", a Temperature gauge for taskbar

I get an error:

The github for it says rebooting gnome helps with errors, "rebooting gnome-shell may help (type Alt + F2 and input r in the prompt), but it won't work with Wayland."

but last time i did that it crashed my gnome, I couldnt figure out how to reboot gnome & when i just rebooted OS & tried to log in again, I got bricked out of my freakin OS totally, the login screen was malfunctioning, so i definitely need help & a walkthrough.

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