I resolved the issue by setting proper Page Size (62 x 38 mm) in CUPS and glabels. My QL-570 is now working with the latest driver version 1.4.2-3+b1 from Ubuntu. I attached the glabels template for reference. It is also possible to print smaller labels (same width, different height) without adjusting the printer settings. Perfect!
~napk ** Attachment added: "Brother_DK44205_62x38.template" https://bugs.launchpad.net/ubuntu/+source/ptouch-driver/+bug/1735991/+attachment/5173684/+files/Brother_DK44205_62x38.template -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to ptouch-driver in Ubuntu. https://bugs.launchpad.net/bugs/1735991 Title: QL-570 printer : the led flashes red and nothing happens Status in ptouch-driver package in Ubuntu: Confirmed Bug description: The label printer Brother QL-570 refuses to print ... When I ask the printer to print, the led flashes red and nothing happens. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: printer-driver-ptouch 1.4.2-2 ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8 Uname: Linux 4.13.0-17-generic x86_64 ApportVersion: 2.20.7-0ubuntu3.5 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Dec 3 13:46:56 2017 InstallationDate: Installed on 2017-12-03 (0 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018) SourcePackage: ptouch-driver UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ptouch-driver/+bug/1735991/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp