hi when i try to install them i get this : Connection Information
To perform the requested action, WordPress needs to access your web server. Please enter your FTP or SSH credentials to proceed. If you do not remember your credentials, you should contact your web host.
*and when i try to Upload Theme i get this:
The uploaded file could not be moved to wp-content/uploads/2014/06
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installation wordpress i did this https://www.digitalocean.com/community/articles/how-to-install-wordpress-on-ubuntu-14-04