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3

This will resolve your issue: wget -qO - https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/xUbuntu_18.04/Release.key | sudo apt-key add - Then: sudo apt-get update


2

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 https://repo.vivaldi.com/stable/linux_signing_key.pub sudo apt-key add linux_signing_key.pub


1

It's possible a problem with Rufus, not with elementary OS. You could download the elementary ISO yourself here: https://elementary.io/ 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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