Richard Kurz a écrit :
"Error creating thumbnail: sh: line 1: /usr/bin/convert: No such file or directory"
Did you install ImageMagick ? in case you did, change in Localsettings.php the path to the executable "convert" ($wgImageMagickConvertCommand = /path/to/convert) in case you did not, install it and change the path in localsettings.php