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This will resolve your issue: wget -qO - | sudo apt-key add - Then: sudo apt-get update


Just remove the repo for your system: sudo rm /etc/apt/sources.list.d/vivaldi.list I hope this help you Edit: Could you please try: cd ~ wget sudo apt-key add


It's possible a problem with Rufus, not with elementary OS. You could download the elementary ISO yourself here: After that you can point to the downloaded image from Rufus. You could also use another tool like YUMI, UnetBootin or Balena Etcher.

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