CBQE-0 fix install sherlock in ubuntu 12.04 in direct url

Change-Id: I36624a292ac56d611bdf84ee32fe642fd99887ee
Reviewed-on: http://review.couchbase.org/44740
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>