I have done a 'clean' installation of RedHat-6.0 twice with the same effect.
Although the howto-greek*rpm package is "installed" ( I find it in the system),
the directory where it supposed to be DOES NOT EXIST!
1. Checked the rpm's: rpm -K --nopgp
2. Searched the directory structure for the files
3. Re-installed the package
The package is only reported in the system by rpm
The files in the various howto packages are marked per-language
using %lang(el) (e.g. for greek). That means you will have to
LANG=el rpm -U howto-greek-*.noarch.rpm
in order to get the greek howto installed. For multiple languages,
LINGUAS=el:fr:de:en rpm -U howto-*