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W: GPG error: http://repo.vivaldi.com/stable/deb stable Release: The following signatures were invalid: BADSIG 793FEB8BB69735B2 Vivaldi Package Composer KEY06 <packager@vivaldi.com>
E: The repository 'http://repo.vivaldi.com/stable/deb stable Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
N0rbert
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Fardin Elahi
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    If you are trying to install the Vivaldi web browser, you could also go to [their download page](https://vivaldi.com/download/), and and use the dropdown to select the correct architecture (probobly 64bit, but maybe not). Download the correct version, and install it with [this](https://askubuntu.com/q/40779/1438484). – cocomac Oct 27 '21 at 19:07

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You have to download their GPG key and add it to the system by using command below:

cd /tmp
wget -c http://repo.vivaldi.com/stable/linux_signing_key.pub
sudo apt-key add linux_signing_key.pub

then update package lists again by sudo apt-get update as usual.

N0rbert
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  • But it still says W: GPG error: http://repo.vivaldi.com/stable/deb stable Release: The following signatures were invalid: BADSIG 793FEB8BB69735B2 Vivaldi Package Composer KEY06 E: The repository 'http://repo.vivaldi.com/stable/deb stable Release' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. – Fardin Elahi Oct 28 '21 at 09:34
  • Then retry by `sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 793FEB8BB69735B2` . – N0rbert Oct 28 '21 at 09:38