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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