[NTG-context] Help with installation

Hallo. I'm sorry to bother you this time but I would really apprecitate your help. I've installed Ubuntu 12.10 64 bit on a new disk. I downloaded the last stable version of ConTeXt suite (today). The installation was all right. However, when I run texexec (e.g. texexec --help), I get the following error: /programy/context/tex/texmf-linux-64/bin/mtxrun:15228: attempt to index field 'loaders' (a nil value) The same happens with context (e.g. context --help). Can you tell me what to do? I guess I simply need to install some libraries. This is the first time I've tried 64 bit Ubuntu. Best wishes Michal