open veusz

These are only warning messages. You don't need astropy/sampy unless you are interested in VO or SAMP support (used in astronomy and astrophysics).

How did you install Vuze? What steps did you take?

@Evaria: if you installed veusz from the standard Ubuntu repositories, you should not be encountering this error at all....

Here is the output of the following Terminal command in Ubuntu 14.04 LTS:

$ apt-cache show veusz
Package: veusz
Priority: optional
Section: universe/science
Installed-Size: 3212
Maintainer: Ubuntu Developers <email address hidden>
Original-Maintainer: Python Applications Packaging Team <email address hidden>
Architecture: all
Version: 1.15-1build3
Depends: python-numpy, python-qt4, veusz-helpers (>= 1.15-1build3), python (>= 2.7), python (<< 2.8), python:any (>= 2.7.1-0ubuntu2)
Suggests: python-pyfits
Filename: pool/universe/v/veusz/veusz_1.15-1build3_all.deb
Size: 714488
MD5sum: d420ee0ac3f384e7296877dd257aee0f
SHA1: 1411d6c0a31de1091b3d8463284369613d269f6c
SHA256: f95017aa8b19561fdb3014200d7a96ea0faf55be56784265bb1c1bdc934ed627
Description-en: 2D scientific plotting application with graphical interface
 Veusz is a 2D scientific plotting and graphing package, designed to
 produce publication-ready Postscript or PDF output. Veusz provides a GUI,
 command line and scripting interface (based on Python) to its plotting
 facilities. The plots are built using an object-based system to
 provide a consistent interface.
Description-md5: 0c82e56a1101813decd2aebc6606f4b6
Homepage: http://home.gna.org/veusz/
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu

python-astropy and sampy are not in the list of package dependencies in the output above.

So they are not required when working in veusz. Those are optional packages....

The version 1.15 is very old and bug. It doesn't support astropy or sampy, anyway. More recent versions can be obtained here if you're using an older Ubuntu: https://launchpad.net/~jeremysanders/+archive/ubuntu/ppa