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run in terminal
sudo apt update && sudo apt upgrade && sudo apt clean && sudo apt autoremove -
How to hide sidebar activity ?
gsettings set org.gnome.shell.extensions.dash-to-dock autohide false
gsettings set org.gnome.shell.extensions.dash-to-dock dock-fixed false
gsettings set org.gnome.shell.extensions.dash-to-dock intellihide false-
Install Chrome from https://www.google.com/chrome/ this will automatically and google repository and also will make sure chrome is upto date.
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How to remove FireFox from Ubuntu ?
sudo apt-get purge firefox