@michaa7 Step 1: Don't do it, installing the deb file will take care of it.

It will also configure the repository.

Any user doing it the manual/old way got into trouble due to outdated keyring material added during this long forgotten step.

If you think you want to be paranoid: Avoid installing the deb package.
It will add an additional (unrestricted) repository entry and drop a cron script to keep it active.

To deploy new versions of the deb package content manually:

keep the keyring file up to date with the repo version download the deb file when a new release drops extract the relevant parts of the package and place them wherever #!/bin/sh # extract vivaldi debian package content arch="${1}" dest="${2}" # distributor signature source keyring="/etc/apt/keyrings/vivaldi-browser.gpg" # verify archive content (ar p "${arch}" _gpgbuilder | gpg --verify "--keyring=${keyring}" -) || exit 1 sum=`ar p "${arch}" data.tar.xz | sha1sum | cut -d' ' -f1` echo "${sum}" (ar p "${arch}" _gpgbuilder | grep "${sum}" | cut -d' ' -f2,4) || exit 2 # extract '/opt' content [ -n "${dest}" ] || dest='.' ar p "${arch}" data.tar.xz | tar -C "${dest}" -xJf- --strip 2 ./opt

Playing MKV files in the Browser