gdImageStringFT: Could not find/open font while printing string values of mean with font Helvetica

[garfieldpbj]

Can anybody help me what to do when I get the following error when trying to
print to a .png file? 

gdImageStringFT: Could not find/open font while printing string value with
font Helvetica 
? 

I have searched the internet, but nothing seems to help.. 

The problem arose after i upgraded to ubuntu 8.04 from 7.10 

/Peter
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