Adobe no longer supports their PDF reader on Linux and the official page does not offer it for download. \
However, some files may not display properly on Ubuntu's default PDF reader Evince or PDF forms may not work as expected. Hence, you may still need to use it.

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Here is how to install the Adobe Reader (acroread) if you need to:

1. Download the .deb archive from the Adobe servers (yes, it's still there):

   cd /tmp && wget http://ardownload.adobe.com/pub/adobe/reader/unix/9.x/9.5.5/enu/AdbeRdr9.5.5-1_i386linux_enu.deb
   

2. Install required dependencies first:

   sudo apt-get install libgtk2.0-0:i386 libnss3-1d:i386 libnspr4-0d:i386 lib32nss-mdns libxml2:i386 libxslt1.1:i386 libstdc++6:i386
   

3. Install the downloaded .deb file:

   sudo dpkg -i AdbeRdr9.5.5-1_i386linux_enu.deb
   

The above instructions worked for me on a 64 bit Ubuntu 14.04.