* For Ubuntu: Please be aware that the time of writing, Qt5.4 is unavailable in the official repositories Ubuntu 14.04/Mint 17
* Add this PPA for Qt5.4: `sudo add-apt-repository ppa:beineri/opt-qt542-trusty`
* If you get a 404 error from "apt-get update" below, open System Settings:Software & Updates:Other Software and edit the entry for opt-qt542-trusty to reference Distribution: trusty.
* Run the following in your terminal: `sudo apt-get update && sudo apt-get install qt54tools qt54base qt54declarative qt54serialport qt54svg qt54webkit qt54quickcontrols qt54xmlpatterns qt54x11extras qt54websockets qt54sensors qt54script qt54quick1 qt54multimedia qt54location qt54imageformats qt54graphicaleffects qt54connectivity libsdl1.2-dev libudev-dev`
* Next, set the environment variables by executing in the terminal: `source /opt/qt54/bin/qt54-env.sh` or copy and paste the contents to your `~/.profile` file to set them on login.
* Verify that the variables have been set: `echo $PATH && echo $QTDIR`. The output should read `/opt/qt54/bin:...` and `/opt/qt54`.
* For Ubuntu: Install Qt 5.5.1 using the Qt online installer. http://download.qt.io/official_releases/online_installers/qt-unified-linux-x64-online.run
If you get this error when running qgroundcontrol: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version 'GLIBCXX_3.4.20' not found. You need to either update to the latest gcc, or install the latest libstdc++.6 using: sudo apt-get install libstdc++6.
