cups-snap | Complete CUPS printing stack in a snap

The CUPS Snap works on both classic systems (standard Linux distributions like Ubuntu Desktop) and purely snap-based systems (like Ubuntu Core). If on your classic system there is already CUPS running, the CUPS Snap's cups-daemon works as a proxy to protect the system's CUPS daemon against adminstrative requests from applications from the Snap Store (proxy mode). For this the CUPS Snap will get automatically installed as soon as a Snap which prints is installed from the Snap Store. Then it does it s job fully automatically without any configuration (like creating queues) needed by the user. For developemnt purposes the CUPS Snap's CUPS daemon can also be run as an independent second daemon in parallel to the system's CUPS, on an alternative port and domain socket (parallel mode). Note that running two independent CUPS instances on one system is not recommended on production systems. It is error-prone and confusing for users. This mode is also not well tested. Disable or remove your system's CUPS if you want to use the Snap's CUPS as your standard CUPS. Usually if you decide to manually install this Snap, you want to use it as the standard CUPS for your system. Therefore we tell here how to disable the system's original, classically installed CUPS and run the CUPS Snap as standard CUPS (stand-alone mode).