You need to add the Ubuntu repository first. Run the following commands under root permission:
$ curl -s http://archive.scrapy.org/ubuntu/archive.key | sudo apt-key add -
$ echo "deb http://archive.scrapy.org/ubuntu precise main" >> /etc/apt/sources.list
$ apt-get update
$ apt-get install scrapyd-0.14
Also note that the latest version of Scrapyd available up to date is 0.17