message: Add Ubuntu PPA install instructions
diff: @@ -40,9 +40,13 @@ Precompiled binaries are available from the [GitHub releases page](https://githu
  Some operating systems already provide binaries for Alacritty, for everyone
  else the instructions to build Alacritty from source can be found [here](INSTALL.md).
  -### Pop!\_OS
  +### Pop!\_OS / Ubuntu
  -Provided in the [Pop!\_OS repositories](https://launchpad.net/~system76/+archive/ubuntu/pop) for 18.04 (bionic) and higher.
  +> If you're not running Pop!_OS, you'll have to add a third party repository first:
  +>
  +> ```sh
  +> add-apt-repository ppa:mmstick76/alacritty
  +> ```
  ```sh
  apt install alacritty
  