Update readme to include Flatpak instructions

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Tor Browser Launcher
 
-_**Are you getting an error?** Sometimes updates in Tor Browser itself will break Tor Browser Launcher. There's a good chance that the problem you're experiencing has already been fixed in the [newest version](https://github.com/micahflee/torbrowser-launcher/releases), but Linux distributions can be slow to provide up-to-date packages. In this case, you can install from the PPA (instructions below), or [build from source](/BUILD.md)._
+_**Are you getting an error?** Sometimes updates in Tor Browser itself will break Tor Browser Launcher. There's a good chance that the problem you're experiencing has already been fixed in the [newest version](https://github.com/micahflee/torbrowser-launcher/releases). Try installing from Flatpak (instructions below), or [build from source](/BUILD.md)._
 
 Tor Browser Launcher is intended to make Tor Browser easier to install and use for GNU/Linux users. You install ```torbrowser-launcher``` from your distribution's package manager and it handles everything else:
 
@@ -16,11 +16,38 @@ You might want to check out the [security design doc](/security_design.md).
 
 ![Tor Browser Launcher screenshot](/screenshot.png)
 
-# Installing from the PPA
+# Installing torbrowser-launcher
 
-If you want to always have the latest version of the `torbrowser-launcher` package before your distribution gets it, you can use my PPA:
+You can install `torbrowser-launcher` from your operating system's package manager, but it might be out-of-date and have issues working. If you want to make sure you always have the latest version, use one of the methods below to install:
+
+## Installing in any Linux distro using Flatpak
+
+Install Flatpak using these [instructions](https://flatpak.org/setup/).
+
+Then install `torbrowser-launcher` like this:
+
+```
+flatpak install flathub com.github.micahflee.torbrowser-launcher -y
+```
+
+Run `torbrowser-launcher` either by using the GUI desktop launcher, or by running:
+
+```
+flatpak run com.github.micahflee.torbrowser-launcher
+```
+
+## Installing from the PPA
+
+If you use Ubuntu or one of its derivatives:
 
 ```sh
 sudo add-apt-repository ppa:micahflee/ppa
+sudo apt update
 sudo apt install torbrowser-launcher
 ```
+
+Run `torbrowser-launcher` either by using the GUI desktop launcher, or by running:
+
+```
+torbrowser-launcher
+```
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