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VIVALDI > installation
Import the public key (to allow for verification of the APT repository)–triple-click to select the entire line
wget -qO- https://repo.vivaldi.com/archive/linux_signing_key.pub | sudo apt-key add -
Add the repository
sudo add-apt-repository 'deb https://repo.vivaldi.com/archive/deb/ stable main'
Install Vivaldi
sudo apt update && sudo apt install vivaldi-stable