Hello,
I've a Raspberry with CUPS that shares a Samsung printer to all the home computers.
It always worked fine with every distro and system I used (Fedora/Windows/Mint) simply configuring the system printer to http://Local-IP-Address:631/printers/Samsung

Yesterday I've installed KDE neon and I can't figure out how to make it work.

The cups client on my PC says: Sending data to the printer
The cups "server" on the Raspberry says: "SpliX Cannot open job"

Splix is the drivers package. Linux Mint was based on the same Ubuntu LTS version of KDE Neon but in Neon it doesn't work. It seems that the server receives the command to print, but for some reason it doesn't print.
I've tried everything and also updated and restarted both (client and server) but it doesn't work. Printing from a Windows PC works fine as usual.

Any idea?

Hello,
I finally figured out how to make it work.

I don't know why, but all the other distro and operating systems worked by printing on this address http://192.168.1.123:631/printers/Samsung
On KDE Neon it works only printing on ipp://192.168.1.123:631/printers/Samsung
So the difference is to use the ipp://protocol instead of http://

It's pretty strange because in Windows, Fedora Mate and Linux Mint it always worked with the http:// address.
Anyway it's not a big issue. If someone has the same problem can solve it just changing the protocol used.

Just another update since I've encountered the same problem on Kubuntu, but it has not been solved with the "ipp" protocol only.

I've had to set the ipp protocol, but also change the driver from "SCX-4200" to "SCX-4200 IPP Everywhere".
The driver was already installed with the splix package