How to install Sigil ePub editor on Ubuntu 12.04

Sigil, the best ePub e-book creation and editor tool I know, has no longer an official Linux version.
However, it is still possible to get a native copy running on your Ubuntu.
Please refer to this askubuntu post if the below method does not work for you (because it is probably already outdated).

On Ubuntu 12.04:
You'll need to add two repositories, one for Sigil and one for a dependency, then update repos, and install:

sudo add-apt-repository ppa:sunab/sigil-git
sudo add-apt-repository ppa:beineri/opt-qt521
sudo apt-get update
sudo apt-get install qt52base qt52webkit
sudo apt-get install sigil