Comment 7 for bug 1808581

> -rw-r----- 1 root lp 131822 Dec 14 13:17 MX860.ppd

There is nothing wrong here. A PPD is not readable by a user process, only by one with root privileges. Whatever you ran did not have root privileges.

You are using the gutenprint PPD for MX860; no problem there.

Now do

 lpadmin -p mx860 -v socket://<IP_address_of_printer:9100> -E -P /etc/cups/ppd/MX860.ppd

and print with

 lp -d mx860 /etc/nsswitch.conf

I am guessing that the Canon printer accepts jobs on port 9100 - most printers do.

You could also set up lpadmin with -v cnijnet:/00-1E-8F-74-5A-78 and see how you go on.

--
Brian.