How to install Atom in Ubuntu via PPA:
Webupd8 Team is maintaining an unofficial PPA with most recent Atom packages for all current Ubuntu releases, and derivatives. While official Linux binary is 64-bit only, the PPA supports both 32-bit and 64-bit.
1. Add PPA
Open terminal (Ctrl+Alt+T) and run the command:
$ sudo add-apt-repository ppa:webupd8team/atom
2. Update and install Atom editor:
Update system package index and install the text editor via command:
$ sudo apt update; sudo apt install atom
Once Atom is installed and a new release is out in future, you can simply upgrade the editor by running regular system updates via Software Updater utility.
3. (Optional) To remove Atom text editor
To remove the software, use Synaptic Package Manager or just run apt command with remove flag:
$ sudo apt remove --purge atom
And the PPA can be remove via Software & Updates utility under Other Software tab.