I recently updated my Pop!OS sandbox environment, and noticed that it was running an older version of the VirtualBox Guest Additions. When I tried to update it, it gave me an error message that looked like this:
Error constructing proxy for org.gnome.Terminal: /org/gnome/Terminal/Factory0: Failed to execute child process “dbus-launch” (No such file or directory)
This was remedied by installing dbus-11, like so:
apt-get install dbus-11
Just in case you also run into this