gcr-viewer command not found

In this troubleshooting guide we learn how to fix gcr-viewer command not found error message

Introduction

When you run more command in linux terminal / console, you get the following error message

gcr-viewer: command not found

or when using sudo you get the following error message

sudo: gcr-viewer: command not found

In Ubuntu gcr-viewer is provided by gcr package.

gcr is:

GCR is a library for crypto UI and related tasks.

This package contains the certificate viewer and prompter service.

To fix this problem, we can install more using the command below.

sudo apt-get -y install gcr

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install gcr.

sudo apt -y install gcr

Or if you have aptitude installed you can use the following command.

sudo aptitude install gcr

In this tutorial we learn how to fix gcr-viewer command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.