As reported in referenced bug, udev rule is a workaround. The real problem is TCSADRAIN that don't work correctly with usb to serial adapters. I don’t know if it's a bug related to kernel or to some others library.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1702320 Title: CUPS serial backend don't initialize correctly USB to serial converters To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/udev/+bug/1702320/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs