Download FS-UAE for Linux
Download the two .tar.xz archives and extract the contained FS-UAE and FS-UAE-Launcher directories to wherever you like. You must keep these directories stored alongside each other.
The fs-uae-launcher executable is found within FS-UAE-Launcher/Linux/x86-64. You can of course make a shortcut or symlink to this to make starting it more convenient.
Plugins
The following plugins can be used to extend the functionality of FS-UAE. CAPSImg provides support for .ipf floppy images while QEMU-UAE provides PPC emulation support.
The plugins must be installed into Documents/FS-UAE/System. For example, the CAPSImg directory should be extracted as Documents/FS-UAE/System/CAPSImg.
Portable version
If you want to convert Documents/FS-UAE to a portable directory which you can move wherever you want, just follow these two simple steps:
FS-UAE Arcade
FS-UAE Arcade builds are not done for version 3.1 yet. However, arcade mode is included with FS-UAE Launcher. So you can generally run fs-uae-launcher --arcade to launch the arcade interface if you know how to run the executable directly with additional arguments.
License
FS-UAE is licensed under the terms of the GPLv2 license. FS-UAE Launcher and FS-UAE Arcade are also licensed under the terms of the GPLv2 license. Other libraries are licensed under various open source licenses. See the license page for more information.