14.04LTS: Garbage in pdflatex output with invoice.sty (fix included)

When using pdflatex with the graphics and invoice packages in Ubuntu 14.04 LTS, garbage output is present on the first page of the PDF output.

How to reproduce:

Create file test.tex:

-----8>-----
\documentclass{article}

\usepackage[english]{babel}
\usepackage{graphics}
\usepackage{invoice}

\begin{document}
foo
\end{document}
----->8-----

Run "pdflatex test.tex", "evince test.pdf".

The first page shows garbage (a list of dates), followed by the expected output:

-----8>-----
[2007/09/09] ... [2009/07/12]foo
----->8-----

Notes:
  - The problem doesn't show up in Ubuntu 12.04LTS, with a local copy of the invoice LaTeX package (12.04LTS doesn't provide the invoice package),
  - Removing "\usepackage{graphics}" makes the garbage go away,
  - Removing "\usepackage{invoice}" makes the garbage go away.

The following patch fixes the problem:

--- invoice.sty.orig 2014-05-30 11:21:00.621445210 +0200
+++ invoice.sty 2014-05-30 11:21:28.125445149 +0200
@@ -149,7 +149,7 @@
 \RequirePackage{ifthen}
 \RequirePackage{longtable}
 \RequirePackage{calc}
-\input{fp}
+\RequirePackage{fp}
 \input{invoice.def}
 %
 \newcommand{\InvoiceVersion}{0.9}%