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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, and and use the dropdown to select the correct architecture (probobly 64bit, but maybe not). Download the correct version, and install it with this. – cocomac Oct 27 '21 at 19:07

1 Answers1

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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 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. – 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