dirmngr software package provides server for managing certificate revocation lists, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install dirmngr
dirmngr is installed in your system.
Make ensure the dirmngr package were installed using the commands given below,
$ sudo dpkg-query -l | grep dirmngr *
You will get with dirmngr package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Utilities |
| Package | dirmngr |
| Version | 1.1.0-1 |
| Description | server for managing certificate revocation lists |
| Sub Section | Utils |