Guys, According to my investigation the main problem of installation/upgrade is problem with different unresolved dependences. It is caused by absolutely different reasons and it is really annoyed our clients who wants to install or upgrade Plesk and can't do it due to these dependences problems. Therefore I have created this thread for gathering all your installation 'success stories'. I need to know when and with which conditions Plesk can be installed without any dependences problems. Please share your experience here. For example, you have installed fresh Ubuntu or CentOS and you have not started yum or apt-get for updating system and after that you run Plesk installation and it goes fine. Or vice versa. Or something else. Please describe your conditions and details for success installation/upgrade here. It will help us make Plesk better. Thank you very much.