it seems as if you have copied header.php of a different theme (the 'old' default theme kubrick) to replace the header.php template of twenty eleven.
find a new copy of header.php of twenty eleven (for instance, download the theme http://wordpress.org/extend/themes/twentyeleven to your computer, unzip it, and extract header.php); and replace header.php;
then simply add the favicon line:
<link rel="shortcut icon" href="http://sean.x10.bz/wp-content/themes/twentyeleven/favicon.ico" />
into the header.php of twenty eleven.
btw:
strongly consider to create a child theme http://codex.wordpress.org/Child_Themes of twenty eleven; it is essential to keep an unedited copy of twenty eleven in the theme folder, as it is the 'fallback' theme in case of any problems.