Firefox flash plugin on ubuntu linux displays no text

I’ve installed firefox flash plugin on ubuntu as firefox asked me to install. But I found out that text is no displayed. After some hours and google searches i found out that the problem is gsfonts-x11 package which was not installed on my ubuntu distributon. As I did
[code]sudo apt-get install gsfonts-x11[/code]
The text suddenly appeared in the flash movies displayed by firefox web browser.