Package: debhelper Version: 9.20150811 Severity: important seen with https://launchpad.net/ubuntu/+source/libmsn/4.2.1-0ubuntu3
the patch renamed the library package, but missed to fix the dh_makeshlibs call, and according to the build logs, it didn't error out, but just did warn: dh_makeshlibs -plibmsn0.3 -V'libmsn0.3 (>=4.1~)' dh_makeshlibs: package libmsn0.3 is not in control info find: `debian/libmsn0.3': No such file or directory I think dh_makeshlibs should fail for this case.