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Install these packages
Ubuntu/Debian
sudo apt install gir1.2-gtop-2.0 lm-sensors
Fedora
sudo dnf install libgtop2-devel lm_sensors
Arch/Manjaro
sudo pacman -Syu libgtop lm_sensors gnome-icon-theme-symbolic gnome-icon-theme git
openSUSE
sudo zypper install libgtop-devel
Log out of your Gnome session, and log back in
Optionally, you can reboot your computer.