Hello, this seems to be introduced with updating libexpat1 from 2.2.0-2 -> 2.2.2-2
The following information has been been gathered while reproducing the mentioned bug: * Building the extension in an up-to-date unstable chroot fails due to translation-files '/chrome/locale/ru/sendReport.dtd' and '/chrome/locale/th/sendReport.dtd cmd: sbuild -n -A -s --force-orig-source --apt-update -d unstable -v adblock-plus_2.7.3+dfsg-1 * Building the Extension in an up-to-date stable chroot suceeds (with equal content in the beforehand mentioned files) cmd: sbuild -n -A -s --force-orig-source --apt-update -d stable -v adblock-plus_2.7.3+dfsg-1 * Reordering the content in both mentioned files (without any deletion or addition) results in succeeding builds with both libexpat1-versions 2.2.0-2 and 2.2.2-2 Please feel free to contact me in order to obtain a minimal test-script along with original and reordered translation files via tristan.lucas...@gmail.com.