Download installer: ftp://ftp.adobe.com/pub/adobe/reader/unix/9.x/9.5.5/enu/ ...and run. I installed .tar.bz2 into /opt.
$ sudo dpkg --add-architecture i386
$ sudo apt install libgdk-pixbuf2.0-0:i386
$ sudo apt install libgtk2.0-0:i386
Download installer: ftp://ftp.adobe.com/pub/adobe/reader/unix/9.x/9.5.5/enu/ ...and run. I installed .tar.bz2 into /opt.
$ sudo dpkg --add-architecture i386
$ sudo apt install libgdk-pixbuf2.0-0:i386
$ sudo apt install libgtk2.0-0:i386