Try this: http://docs.moodle.org/22/en/Installing_Moodle_on_Debian_based_distributions (the /22/ in the URL doesn't mean anything, those instructions are valid for all Moodle versions 1.6 - 2.4).
Installing and upgrading help
installing moodle 2.3.4+ on webserver XAMPP 1.8.1 (o.s. ubuntu 12.04)
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thanks, now everything is working correctly