Problem:
When running apt update, you see the following error message:
Err:27 https://pkgs.tailscale.com/stable/ubuntu jammy InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 458CA832957F5868
Solution:
This error occurs due to the Tailscale repo using the outdated (as of April 2022) apt-key method of importing keys.
You can import the key by just installing the tailscale repo again (these commands are listed on the official tailscale installation page):
curl -fsSL https://pkgs.tailscale.com/stable/ubuntu/jammy.noarmor.gpg | sudo tee /usr/share/keyrings/tailscale-archive-keyring.gpg >/dev/null curl -fsSL https://pkgs.tailscale.com/stable/ubuntu/jammy.tailscale-keyring.list | sudo tee /etc/apt/sources.list.d/tailscale.list
and then running
apt update
again.