How to Fix Unacceptable TLS Certificate Error in Linux

Websites use TLS certificates for authentication and ensuring secure data transfer. Linux system refers to many different websites to download & manage packages. But sometimes you may get ‘Unacceptable TLS certificate’ error in Linux. In this article, we will learn how to fix unacceptable certificate error in Linux.

How to Fix Unacceptable TLS Certificate Error in Linux

There is one solution fixes it all for this problem. We will list a couple of commonly used approaches.

1. Reinstall CA Certificates

One of the simplest solutions is to just reinstall the TLS certificates so that you are using the latest proper ones. Open terminal and run the following command for this purpose.

$ sudo apt install --reinstall ca-certificates

The above command will reinstall trusted CA certificates, in case there is an issue with the list.

2. Add Trusted Certificates in Linux Distro

If you are using your organization’s VPN to access remote content, you may need to add the certificate to list of trusted CAs in your Linux distro.

First, login as administrator and go to /usr/local/share/ca-certificates.

Create a folder for your organization and add the certificate (.crt) file in it. Once you have added the certificate, run the following command to update CA certificates.