# How to Fix ‘Unacceptable TLS certificate’ Issue on Linux

**URL:** https://www.compsmag.com/blogs/how-to-fix-unacceptable-tls-certificate-issue-on-linux/
**Author:** Ayushi Chauhan
**Published:** 2022-04-29
**Updated:** 2022-04-29
**Categories:** Blogs
**Tags:** Android Guides, Apple Guides, Blogs Daily, Computer Guides, Computers Tips and Tutorials, Google tips and tutorials, guiderobert, Guides and Tutorials, guiding12, How To Guide, How To Guides, ios Guides, Linux Guides, Software tips and tutorials, Tips, Tricks, Windows Tips
**Reading Time:** 3 min

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This tip is about the how to Fix ‘Unacceptable TLS certificate’ Issue on Linux. So read this free guide, How to Fix ‘Unacceptable TLS certificate’ Issue on Linux step by step. If you have query related to same article you may contact us.

## How to Fix ‘Unacceptable TLS certificate’ Issue on Linux - Guide

Linux is an open source operating system like other operating systems, for example Microsoft Windows, Apple Mac OS, iOS, Google Android, etc.  An operating system is software that allows communication between computer hardware and software.  It mediates the inputs that are processed by the processor and passes the outputs to the hardware to display.  This is the basic function of an operating system.  While it performs many other important tasks, we won't talk about them.  Linux has been around since the mid-90s.

It can be used in everything from wristwatches to supercomputers.  It's everywhere in our phones, laptops, PCs, cars and even refrigerators.  It is very popular among developers as well as regular computer users.  When it comes to TLS certificates, you will encounter a number of issues, some of which are browser related or may occur on the backend of a website.  A similar error is “Unacceptable TLS certificate” on Linux system.

In my case, we found the difficulty when we added the Flathub repository via the terminal, a step that allows accessing the large selection of Flatpaks after installing Flatpak.  However, this error can also occur when you install a Flatpak app or use an official Flatpak file from a third-party repository via the terminal.  Some users discovered this problem when they abused the VPN service recommended by their company to work on UNIX.  then how to fix it?

## How to    Fix 'Unacceptable TLS certificate' issue on Linux

Add the Storefront root certificate as a system cacert.  Following are the steps on Debian/Ubuntu machines to add a certificate as a system certificate.  (Note: System CA certificate path may differ between distributions).

Go to /usr/local/share/ca-certificates

cd /usr/local/share/ca-certificates

Create a new folder there

Now copy the .crt version of the Storefront root certificate (eg samlservercert.crt) to this folder.

cd samlstore

sudo cp ~/downloads/samlservercert.crt

Now update your CA certificates

sudo update-ca-certificates

Running the above command should show that it has added the certificate.

Now just terminate your daemon processes

killall AuthManagerDaemon ServiceRecord

Start your self-service again and add the store.  You should no longer see the “Unacceptable TLS Certificate” window.

## Final note

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