The guide shows how to add LibreWolf’s official APT repository for the Debian 12 “bookworm” suite to LMDE 5, import its GPG signing key, and then install the browser with a single sudo apt install librewolf command after updating the package list. It explains why each step matters: pointing to a compatible binary source, verifying package integrity with the public key, and ensuring apt can see the latest version. Optional post‑install tweaks include setting LibreWolf as the default web browser via xdg-settings and enabling automatic updates through LMDE’s existing unattended‑upgrades mechanism. Finally, it notes that the native .deb install is slimmer and better integrated than a flatpak alternative, and offers a quick fix (sudo apt -f install) for any missing‑library issues.

Install LibreWolf Browser on LMDE 5

You’ll get LibreWolf up and running on Linux Mint Debian Edition 5 without hunting for random .deb files. The steps below add the official repository, pull in the signing key, and install the browser with a single apt command.

Add the LibreWolf repository

LibreWolf isn’t packaged in LMDE’s default repos, so you have to tell apt where to look.

echo "deb [arch=amd64] https://repo.librewolf.net/apt bookworm main" | sudo tee /etc/apt/sources.list.d/librewolf.list > /dev/null

Why this matters: By pointing at the “bookworm” suite you get the same binaries Debian 12 uses, which are compatible with LMDE 5’s underlying Debian base.

Import the signing key

Apt refuses to install unsigned packages. Grab LibreWolf’s public key and add it to your trusted store:

wget -qO- https://repo.librewolf.net/pubkey.gpg | sudo gpg --dearmor -o /usr/share/keyrings/librewolf-archive-keyring.gpg

Why this matters: The key guarantees the packages you download haven’t been tampered with. Skipping this step will leave apt whining about “NO_PUBKEY”.

Update the package list and install

Now that the source and its trust anchor are in place, refresh apt’s cache and pull LibreWolf:

sudo apt update
sudo apt install librewolf

Why this matters: apt update makes sure your system sees the newest version available from the new repo. The install command pulls all dependencies automatically.

Optional tweaks

• Set LibreWolf as default browser – run xdg-settings set default-web-browser librewolf.desktop.
• Enable automatic updates – LMDE’s unattended-upgrades script respects third‑party repos, so you can leave it on if you like staying current without manual checks.

I’ve seen people install the flatpak version out of habit, but that adds a whole runtime layer you probably don’t need on a system already using apt. The native .deb is leaner and integrates with your menu bar right away.

That’s it – LibreWolf should now launch from the menu or by typing librewolf in a terminal. If you hit a missing library error after a kernel tweak, just rerun sudo apt -f install; it fixes most dependency hiccups.