Found the solution for this problem: You need to use English locale settings. To check which language is set, use the "locale" command in the terminal. If this is your output, you shouldn't have any troubles anymore: LANG=en_US.UTF-8 LANGUAGE=en LC_CTYPE="en_US.UTF-8" LC_NUMERIC=en_US.UTF-8 LC_TIME=en_US.UTF-8 LC_COLLATE="en_US.UTF-8" LC_MONETARY=en_US.UTF-8 LC_MESSAGES="en_US.UTF-8" LC_PAPER=en_US.UTF-8 LC_NAME=en_US.UTF-8 LC_ADDRESS=en_US.UTF-8 LC_TELEPHONE=en_US.UTF-8 LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=en_US.UTF-8 LC_ALL= Using any other language will cause troubles. I use lubuntu 12.04. Changing the language was done for me by setting the default language to the system to "English" and changing the additional language stuff to english as well (currencies, date time, etc). To the programmers I'd suggest adding support for multi language locales. Greetings and best wishes ~