This is my personal guide for installing the UCLab root CA certificate on Arch Linux, ensuring it’s trusted by the system and all major browsers including Microsoft Edge.

Prerequisites

• Root/sudo access
• The uclab-root-ca.cer certificate file
• The certificate is already in PEM format (no conversion needed)

Step 1: Install Certificate System-Wide

Copy the UCLab certificate to the system trust store:

sudo cp uclab-root-ca.cer /etc/ca-certificates/trust-source/anchors/

Update the system trust store:

sudo trust extract-compat

Verify the certificate was added:

trust list | grep -i uclab

You should see:

    label: uclab-AD1-CA

At this point, most command-line tools (curl, wget, git, etc.) and some browsers will trust your CA.

Step 2: Configure Microsoft Edge (and Chrome/Chromium)

Edge and Chromium-based browsers on Linux use the NSS (Network Security Services) certificate database, which is separate from the system trust store.

Add Certificate to NSS Database

First, check your NSS database location:

ls -la ~/.pki/nssdb/

Add your certificate to the NSS database:

certutil -A -n "uclab-AD1-CA" -t "C,," -i /etc/ca-certificates/trust-source/anchors/uclab-root-ca.cer -d sql:$HOME/.pki/nssdb

Important notes:

• Don’t use sudo - this modifies your user’s database, not root’s
• The -t "C,," flag sets the certificate as trusted for SSL/TLS

Verify Installation

List certificates in your NSS database:

certutil -L -d sql:$HOME/.pki/nssdb

You should see your certificate listed with trust attributes C,,:

Certificate Nickname                                         Trust Attributes
                                                             SSL,S/MIME,JAR/XPI
uclab-AD1-CA                                                 C,,

Restart Edge

Kill all Edge processes and restart:

pkill -9 msedge

Then launch Edge normally. Your custom CA should now be trusted.

Verification

Test that your certificate works:

# Test with curl (replace with your actual UCLab domain)
curl -v https://your-uclab-site.example.com

# View certificate details in NSS database
certutil -L -d sql:$HOME/.pki/nssdb -n "uclab-AD1-CA"