Twenty-Eleven child-theme not showing up for activation

Hey everybody out there,

sorry for bothering, but i kinda searched google for hours not finding anything helpful. Either it’s a new problem or (what is more likely) i’m an idiot, because i’m like completely new to blogging and especially wordpress.

My problem: My child-theme is not showing up for activation when i try to in the design->themes section.

I’m trying to set up a child-theme for the twenty-eleven theme at my domain Exposure Of Sound. Checked the official WP.org tutorial, and it seemed simple to me. So i created a new directory at “/wp-content/themes” called “twentyeleven-child”. I placed only the style.css in the directory, including following code:

/*
Theme Name:     twentyeleven-child
Theme URI:
Description:    Child theme for the Twenty Eleven theme
Author:         Your name here
Author URI:     http://www.exposureofsound.de/uber-mich/
Template:       twentyeleven
Version:        0.1.0
*/

@import url("../twentyeleven/style.css");

Theres nothing else in the directory.
Different hits at google suggested:
1. Checking template name (Same as parent theme folder name)
2. Problems with wrong line break type (only working with Windows cr, or unix lf)
3. Checking if there’s any broken theme link at the bottom of the page.

Checked everything of the above, even tried the “One-Click Child Theme”-Plugin. It essentially did what i wanted, but i couldn’t find the ftp-directory where the Plugin stored the child theme.
And in fact i want to understand what i’m missing, and i would rather like to do something myself, than to have another plugin.

Hopefully thats enough information for you to try to help me. I really couldn’t find anything useful with google or boardsearch, and maybe i’m missing something extraordinary dumb, but i would appreciate some help.

Best Regards
Alex