Try running either opera or gwenview from terminal and see what errors You get after pressing the print button. Also provide us some more information about your system like version 11.3 or 11.1 or maybe 11.4. The desktop environment You are using and the repos You’ve got by issuing the command :
"/usr/bin/gwenview(7507)" Error in thread 139827532150608 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827532150608 : "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Invalid iterator."
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Invalid iterator."
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Invalid iterator."
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Invalid iterator."
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Invalid iterator."
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Invalid iterator."
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/gwenview(7507)" Error in thread 139827342121232 : "Invalid iterator."
Hmm as far as I can tell there is nothing to worry about in the log and nothing really connected to the printing errors but that just my personal opinion. I’m using 11.3 so I can’t check to reproduce the behaviour You get. The only thing that comes to my mind is some package conflict. I’m not an expert but I think You don’t need the repos number 2 and 4 as the packages I think You needed from them are in packman repo. If I were You I would try to switch the packages to packman versions but don’t do it just yet as maybe someone else will provide You with more accurate and helpful info