On Ubuntu Desktop or Laptops machine, we need to read PDF files. Although we have one application for reading PDF files. But still Adobe Reader is best PDF files reader world wide. Below instruction would guide how to install Adobe Reader in Ubuntu 16.04

Open a terminal and paste below command and hit enter. This will add repository.
Remove sudo in case already working as root user.

sudo add-apt-repository "deb http://archive.canonical.com/ precise partner"

sudo apt-get update

sudo apt-get install adobereader-enu

Also, remove the precise repository using the below commands

sudo add-apt-repository -r "deb http://archive.canonical.com/ precise partner"

sudo apt-get update

If you like to set Adobe Reader as default PDF Reader, edit file “/etc/gnome/defaults.list”.

Change below line.

application/pdf=evince.desktop

Into

application/pdf=acroread.desktop

Add these lines in the end of file.

application/fdf=acroread.desktop
application/xdp=acroread.desktop
application/xfdf=acroread.desktop
application/pdx=acroread.desktop

Now Just run acroread command on terminal to launch Adobe Reader.
Adobe_reader

Click on Accept.