a thoughtful use of digital
Recently I had a problem with Tab session manager in Vivaldi: impossible to see my sessions, and to add new ones.
I solved in Tab session manager settings in a very simple and easy way: disabling and re-enabling Tab session manager, with a simple mouse click in Vivaldi extensions.
If you get a pop-up window to unlock Vivaldi profile, and you share your Vivaldi profile between different Linux installation (devices), you could try to copy the folder .local/share/kwalletd from the working installation of Vivaldi to the other ones.
After several unsuccessfull attempts to fix a Vivaldi NO_PUBKEY error, I found this working solution:
wget -qO- https://repo.vivaldi.com/archive/linux_signing_key.pub | gpg --dearmor | sudo dd of=/usr/share/keyrings/vivaldi-browser.gpg
and then:
sudo apt update