
Please note that Adobe no longer supports Acrobat Reader for Linux. The latest native Linux version is 9.5.5 dated from 26/04/2013. From this reason you should refrain using/installing Adobe Acrobat Reader to avoid potential vulnerabilities and hacker exploits.
Installation of Adobe Reader in Ubuntu
sudo wget -O ~/adobe.deb ftp://ftp.adobe.com/pub/adobe/reader/unix/9.x/9.5.5/enu/AdbeRdr9.5.5-1_i386linux_enu.deb
sudo dpkg --add-architecture i386
sudo apt update
sudo apt install libxml2:i386 libcanberra-gtk-module:i386 gtk2-engines-murrine:i386 libatk-adaptor:i386
sudo dpkg -i ~/adobe.deb
Launch Adobe Acrobat Reader on Ubuntu
How to Remove Adobe Reader in Ubuntu
sudo apt-get purge adobereader-enu
sudo apt-get autoremove
How to Set Adobe Reader as default PDF reader
Ubuntu 32 bit
sudo gedit /usr/share/applications/AdobeReader.desktop
Ubuntu 64 bit
sudo gedit /usr/share/applications/AdobeReader.desktop
Can't validate signature on PDF [SSL Error]

Restart the Adobe reader and validate the signature
Display of Valid Signature in previous version of Digital Signature:
Display of Valid Signature in Current Version of Digital Signature:
Digital Signature Validation:
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