libgcrypt20 software package provides LGPL Crypto library - runtime library, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libgcrypt20
libgcrypt20 is installed in your system.
Make ensure the libgcrypt20 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgcrypt20 *
You will get with libgcrypt20 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Libraries |
| Package | libgcrypt20 |
| Version | 1.6.3-2+deb8u2 |
| Description | LGPL Crypto library - runtime library |
| Sub Section | libs |