The LabVIEW fonts in Ubuntu 11.04 are not legible. This has been tested with LabVIEW 2010 and 2011. The following images show how the fonts would appear:
To fix the problem, install the xfonts-75dpi and xfonts-100dpi packages. In order to go through with this installation, you can run the following command at the terminal and then reboot the PC:
sudo apt-get install xfonts-75dpi xfonts-100dpi
Just to add. If you come from non-english speaking country (like me) you better use transcoded fonts because it contains also special signs.
The command for the terminal would look like this:
sudo apt-get install xfonts-75dpi-transcoded xfonts-100dpi-transcoded
This also works for LabVIEW 2015 and Ubuntu 16.04.