If you have a Tailscale server running remotely and wanna upgrade the tailscale via apt update && apt upgrade, you are likely to have an issue that the SSH connection dropped when dpkg is configuring the tailscale daemon.
And you will get stuck there with an error
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
But you cannot run and finish it before the connection dropped.