I have been using a D-Link print server on my LAN for many years and have been able to print with 13.2 with the printer set up to be accessed using CUPS with the address
lpd://dlink-6D7033/LPT2
and a PPD file specifying its properties.
Yesterday I installed the latest updates and after rebooting, the previously installed printers were not listed as available. As previously, I used my web browser and address 127.0.0.1:631 to set up the printers again, but and the printer properties are shown correctly when I attempt to print a document, but the spooled file is never removed from the queue, it does not print, and the printer shows no sign of being contacted. I rebooted the print server but this made no difference. I have rebooted the computer but this has not helped.
I had disabled IPv6 because I get no network communication when it is enabled, and I had removed references to IPv6 addresses from the /etc/hosts file. Following a comment I found on the web, I have reinstated those lines, but this has made no difference.
The /var/log/cups/error_log file has this content:
E [23/Apr/2015:08:17:19 +1000] Unable to bind socket for address [v1.::1]:631 - Cannot assign requested address.
E [23/Apr/2015:08:24:53 +1000] [cups-driverd] Bad driver information file "/usr/share/cups/drv/sample.drv"!
E [23/Apr/2015:08:26:20 +1000] [cups-driverd] Bad driver information file "/usr/share/cups/drv/sample.drv"!
E [23/Apr/2015:08:28:15 +1000] cupsdReadClient: 17 IPP Read Error!
E [23/Apr/2015:08:46:43 +1000] Unable to bind socket for address [v1.::1]:631 - Cannot assign requested address.
E [23/Apr/2015:10:10:44 +1000] Unable to bind socket for address [v1.::1]:631 - Cannot assign requested address.
E [23/Apr/2015:10:22:00 +1000] cupsdReadClient: 16 IPP Read Error!
E [23/Apr/2015:10:23:46 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:24:09 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:24:32 +1000] cupsdAuthorize: pam_authenticate() returned 7 (Authentication failure)!
E [23/Apr/2015:10:24:34 +1000] cupsdAuthorize: pam_authenticate() returned 7 (Authentication failure)!
E [23/Apr/2015:10:24:56 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:24:56 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:25:15 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:25:15 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:25:45 +1000] Returning IPP client-error-not-possible for Cancel-Job (ipp://localhost/jobs/5) from localhost
E [23/Apr/2015:10:25:45 +1000] Returning IPP client-error-not-possible for Cancel-Job (ipp://localhost/jobs/5) from localhost
E [23/Apr/2015:10:25:45 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:25:45 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:26:00 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:10 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:10 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:10 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:19 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:19 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:19 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:20 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:20 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:20 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:50 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:30:50 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:31:04 +1000] Returning IPP client-error-not-possible for Cancel-Job (ipp://localhost/jobs/4) from localhost
E [23/Apr/2015:10:31:04 +1000] Returning IPP client-error-not-possible for Cancel-Job (ipp://localhost/jobs/4) from localhost
E [23/Apr/2015:10:31:04 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:31:04 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:34:29 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:35:16 +1000] [Job 4] Stopping unresponsive job!
E [23/Apr/2015:10:35:16 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:45:09 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:45:31 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:45:32 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:45:37 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:45:37 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:45:37 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:45:37 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:46:15 +1000] Returning IPP client-error-bad-request for Create-Printer-Subscription (/) from localhost
E [23/Apr/2015:10:47:43 +1000] Returning HTTP Forbidden for CUPS-Get-Devices (no URI) from localhost
E [23/Apr/2015:10:47:43 +1000] [CGI] CUPS-Get-Devices request failed with status 401: Forbidden
E [23/Apr/2015:10:48:17 +1000] Returning HTTP Forbidden for CUPS-Set-Default (ipp://localhost/printers/brother) from localhost
E [23/Apr/2015:10:52:09 +1000] [Job 6] Stopping unresponsive job!