ExpressPCB is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The best Linux alternative is KiCad, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to ExpressPCB and six of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to ExpressPCB are Fritzing (Paid, Open Source), LibrePCB (Free, Open Source), gEDA Project (Free, Open Source) and VUTRAX (Freemium).
The gEDA project has produced and continues working on a full GPL'd suite and toolkit of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production.