LaserJet won't print from DirectJet 310x and Kubuntu 12.04
 

It often doesn't print using the USB connection. I found an old thread that mentions a print file that no longer is used, though there is a man ref. I ran nran lpinfo -v and sent output to a text file. Results:

network beh
network lpd
network socket
network ipps
network https
network ipp
network http
network smb
direct hp
direct hpfax
network dnssd://HP%20LaserJet%203330%20(0001E692B862)._printer._tcp.local/
network dnssd://HP%20LaserJet%203330%20(0001E692B862)._pdl-datastream._tcp.local/
network dnssd://HP%20LaserJet%203330%20(0001E692B862)._ipp._tcp.local/
network socket://192.168.1.96

I understand the final socket entry and most of the short ones, but the rest are over my head.











it doesn't

When you say

do you mean it sometimes prints? That smells like hardware. At the least, it is wise to rule out hardware before beating yourself over the head with software for hours and hours.

The first thing I would do would be trying a different USB port on the computer; then removing the USB cable from the printer and reseating it (trying a different port on the computer did this already at that end); making sure the connectors are clean, then trying a different, tested USB cable; doing one step at a time, testing after each step, in that order.

While testing, I would also try sending print jobs via the lp command (this may require setting the printer as the default, which can be done via the Gnome control center, at least in Debian) and capturing the output for both successful and failed print jobs.