$ ls oxide-qt_1.8.4-0ubuntu1.dsc 
oxide-qt_1.8.4-0ubuntu1.dsc

$ dput ppa:hjd/ubuntu-dev oxide-qt_1.8.4-0ubuntu1.dsc
Not a .changes file.
Please select a .changes file to upload.
Tried to upload: oxide-qt_1.8.4-0ubuntu1.dsc