Public bug reported:

Binary package hint: r-base

Plots in R fail to display the Greek letter pi correctly, it comes out as an 
inequality sign. Other Greek letters appear to behave as expected. The error is 
not present in Ubuntu 9.04.
The following little sample R script will show the effect

---- cut here -----
x <- seq(0,1,length.out=100)
y <- sin(2*pi*x)
plot(x, y, type='l', main=expression(y == sin(2*pi*x)))

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: r-base 2.10.1-2
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
Architecture: i386
Date: Sun May 30 21:23:54 2010
PackageArchitecture: all
ProcEnviron:
 LC_TIME=en_DK.UTF-8
 PATH=(custom, user)
 LANG=C
 SHELL=/bin/bash
 LC_PAPER=en_DK.UTF-8
SourcePackage: r-base

** Affects: r-base (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 lucid

-- 
R graphics fail to display greek letter pi
https://bugs.launchpad.net/bugs/587617
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