My convertall utility has stopped working in 10.04 LTS. I get an error
Error in unit data - Can not read "units.dat" file
If I ls -l /usr/share/convertall/units.dat, I get
-rw-r--r-- 1 root root 25182 2008-05-27 06:06 /usr/share/convertall/units.dat
Tried uninstalling and re-installing, but no joy.

How can I get convertall working again?