Problem with adding new apps in ownCloud

For every “recommended” app that I try to enable in OwnCloud on my VPS, I get:

App does not provide an info.xml file

Do I need to install them manually first?

I’ve got something similar, there is a solution with a post in french wich help me Pas de contacts/agendas sous owncloud?

Before doing anything, you can make a backup of your Owncloud (not necessary if new installation)

 cp -a /var/www/owncloud /home/admin/owncloud.ori

To resolve the issue, download the tarball from the site of owncloud.
Then you decompress it and just put it on the file applications of your server at the correct place, /var/www/owncloud I suppose.
Be carefull to put the rights like in this example.

Try this in console

 $ sudo -i
 # cd /tmp
 # wget
 # tar xvf owncloud-7.0.2.tar.bz2
 # cd owncloud
 # cp -a apps /var/www/owncloud/
 #  chown -R owncloud:owncloud /var/www/owncloud/apps

and after don’t forget to remove the files in /tmp

# rm -r owncloud-7.0.2.tar.bz2
 # rm -r owncloud

For me it was perfect, then in your Owncloud, you just have to activate the Calendars, Contacts, Documents, pdfviewer, Pictures on the Add Aplications.
Good cloud

Works for me.