Thank you for the error_log. The communication with the printer through the USB->Parallel adapter works now, but the problem is that the driver is too old:
E [05/Mar/2012:21:56:03 +0000] [Job 1] Cannot load libcups or libcups version too old then 1.1.19 Please try to get a newer version of the printer driver. ** Changed in: system-config-printer (Ubuntu) Status: Incomplete => Invalid ** Changed in: system-config-printer (Ubuntu) Status: Invalid => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/946272 Title: Thermal Printer USB CUPS 1.5 UBUNTU 12.04 connection undefined To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/946272/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs