Looks like you don't have the samba-krb-printing package installed. Please install it and check your smb cups backend points to get_print_ticket: # ls -l /usr/lib/cups/backend/smb lrwxrwxrwx 1 root root 28 jun 29 10:22 /usr/lib/cups/backend/smb -> /usr/bin/get_printing_ticket