Marking the Update-Manager task as Invalid, as update-manager does wait until other package management operations complete (tried Checking for updates while software-properties-gtk was reloading packages), only it displays an incorrect (Waiting for synaptic to exit) error message.
Marking the Update-Manager task as Invalid, as update-manager does wait until other package management operations complete (tried Checking for updates while software- properties- gtk was reloading packages), only it displays an incorrect (Waiting for synaptic to exit) error message.