Reactivating the queue daemon
The queue daemon (or qdaemon) process tracks print job requests and the printers available to handle these requests.
The qdaemon maintains queues of outstanding requests and, as devices become available, sends them to the proper device at the proper time. If the qdaemon stops functioning, you will experience printing problems and will then need to restart the qdaemon using the following procedure.
Note: Some
commands may require root user or system group authority.