ualpn command not found

Introduction

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

ualpn: command not found

or when using sudo you get the following error message

sudo: ualpn: command not found

Solutions to ualpn: command not found

How To Fix ualpn: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu ualpn is provided by uacme package.

uacme is:

uacme is a client for the ACMEv2 protocol described in RFC8555, written in plain C with minimal dependencies (libcurl and GnuTLS or mbedTLS). The ACMEv2 protocol allows a Certificate Authority (https://letsencrypt.org is a popular one) and an applicant to automate the process of verification and certificate issuance. The protocol also provides facilities for other certificate management functions, such as certificate revocation. For more information see https://tools.ietf.org/html/rfc8555

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

sudo apt-get -y install uacme

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

You can also use apt command to install uacme.

sudo apt -y install uacme

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

sudo aptitude install uacme

Summary

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