This is LibrePCB, a complete electronic design suite that is free software, featureful and cross platform. It is still a new application at the moment and not yet available on Ubuntu and other major GNU/Linux operating systems. For that purpose, this simple tutorial explains where to grab it and run it instantly on Ubuntu computer --without installation nor an administrator right--.

Requirements 

LibrePCB needs a GNU/Linux operating system on a 64 bit computer and can run under 2 GB memory.

Download LibrePCB

Go to the download page (click here) and download the AppImage version of LibrePCB which is by >=36MB at the moment. 

Permit

Once downloaded, the file name is like librepcb-0.1.5-linux-x86_64.AppImage. Right-click the AppImage file then Properties then Permissions and give Executable permission to it (usually, just give check mark to it) and OK.

Run

LibrePCB runs after you double-clicked the AppImage file. 

Note: if you wish to add LibrePCB to the start menu, simply use Alacarte program on GNOME or right-click the start menu itself on KDE to add it by hand.

Happy designing!