The install script ran fine in Linux but when I try to launch the game from the programs menu nothing seems to happen.

Running ~/GOG Games/Chaos Reborn/start.sh results in:

Running Chaos Reborn
Set current directory to /home/joshua/GOG Games/Chaos Reborn/game
Found path: /home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux.x86
Mono path[0] = '/home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux_Data/Managed'
Mono path[1] = '/home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux_Data/Mono'
Mono config path = '/home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux_Data/Mono/etc'
support/gog_com.shlib: line 94: 6862 Aborted (core dumped) ./"${bin_64}"

Running ~/GOG Games/Chaos Reborn/game/ChaosRebornLinux.x86 results in:

Set current directory to /home/joshua/GOG Games/Chaos Reborn/game
Found path: /home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux.x86
Mono path[0] = '/home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux_Data/Managed'
Mono path[1] = '/home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux_Data/Mono'
Mono config path = '/home/joshua/GOG Games/Chaos Reborn/game/ChaosRebornLinux_Data/Mono/etc'
Aborted (core dumped)

Oddly if I run either the start script or the binary with sudo the splash movies play and I can see and move the game's cursor for about a second before I'm dropped back to the terminal with the same "Aborted (core dumped)" errors.

Seems like it has something to do with i386 vs 64-bit? I've installed all the i386 libraries support recommends and the store page doesn't say anything about other dependencies. Interestingly the demo version on Steam installs and runs without any issues so I'm certain there's something wrong with GOG's package. Or could it be mono? I'm not really sure if that'd matter re i386 vs 64 bit.

I decided to try something on a whim, posting here in case it helps anyone else.

GOG definitely distributes this game wrong for 64 bit linux. Steam has both 64 and 32 bit versions. The demo is free. The binaries are absolutely identical to the paid full version. Copy ChaozRebornLinux.x86_64 from your steam apps folder to your GOG Games folder (where ChaosRebornLinux.x86 is) and run it. Zero problems and it's not the demo if you enter your serial.