Image file upload error: 'image' is not recognized by the 'identify' command

[ShruthiR]

I am using ubuntu 10.10. In my rails 3.1 project, i am not able to upload any type of image files. While uploading an image file it shows an validation error like

/tmp/image1.jpg is not recognized by the 'identify' command.

My ruby version is,
ruby 1.9.3p327

I have installed both ImageMagick & rmagick gem & some other libdev tools. Now my rmagick gem is
rmagick (2.13.1)
& my cocaine gem is
cocaine (0.4.2, 0.2.1)

Also i have done following things,

$ sudo apt-get install imagemagick
$ sudo apt-get install graphicsmagick-libmagick-dev-compat
$ sudo gem install rmagick

$ cd /tmp
$ curl -OL [url]ftp://ftp.imagemagick.org/pub/ImageMagick/ImageMagick.tar.gz[/url]
tar -xzf ImageMagick.tar.gz
cd ImageMagick-6.8.0-10/
./configure --prefix=/usr/local --disable-static --with-modules --without-perl --         without-magick-plus-plus --with-quantum-depth=8 --disable-openmp --with-gs-font-dir=/usr/local/share/ghostscript/fonts
$ make
$ sudo make install

I was tried below command while putting development.rb file,
Paperclip.optio ns[:command_path] = "/usr/local/bin/"

Please help me to solve this issue.