Comment 1 for bug 1168697

It's not really a bug, thus I'm converting your report to a question (handled in the Answers section of the Launchpad site).

The File>Export command works for PNG format only. That's the only bitmap format Inkscape supports, but you can use an external tool (eg Gimp) to convert from PNG to JPG.
As for PDF and EPS, you'll find them in the File>Save As dialog.