After installing the game on Linux and running the start.sh, I get the following error:

Running Trüberbrook
./start.sh: line 21: ./Truberbrook.x86: No such file or directory

The file definitely exists and is exactly where it is supposed to be. I tried running it directly, but I get the same error.

Any ideas?

Thanks!

Same problem. OS Linux

fixed. We use 64bit, but this is 32bit ELF.
readelf -l Truberbrook.x86
it writes "requesting /lib/ld-linux.so.2 (but we have /iib64/ld-linux.so2.x86-64 from glibc.x86_64
we have to install i686 versions of some packages. I installed
glibc.i686
libglvnd-glx.i686
libXcursor.i686
libXrandr.i686 and it started!

Oops. No sound (( Shit...

Can confirm that Trüberbrook Devs have strangely forgotten to include the 64 bit version of Unity Player:
~~
$ file Truberbrook.x86
Truberbrook.x86: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked
$ ldd Truberbrook.x86
linux-gate.so.1 (0xf7fa4000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf7f70000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7f4e000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xf7f43000)
libstdc++.so.6 => /lib/i386-linux-gnu/libstdc++.so.6 (0xf7d65000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf7c5e000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf7c3f000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7a48000)
/lib/ld-linux.so.2 (0xf7fa6000)
~~
But as this is (at least currently) my 49th 32 bit game, it was directly running on my Kubuntu 20.10 STS,
so there should be no problem on Debian/Ubuntu concerning 32 bit libraries for this game ...
at least for now - could change with Ubuntu 22.04 LTS (anounced further redution of 32 bit lib support), though.

A game of 03/2019 should not use 32 bit only - and the engine is "2017.4.4f1" which of cause has
a 64 bit version for Linux (nevertheless it is a little aged ...).
Unfortunately I could not get the file "UnitySetup-Linux-Support-for-Editor-2017.4.4f1.exe"
(but only '2017.4.40f1' which has some API changes so does not work) to get a 64 Bit version
as described in the forum post about "Little Bug" were the 64 version was accidentally missing:
* https://www.gog.com/forum/little_bug/how_to_get_64_bit_binary_for_linux_version
and could be added without a problem.

Will soon try to reach out for publishers/developers - at least there will be no language barrier. ;)

Would be nice if GOG could have an eye on missing 64 bit versions and can do this job before anyone
looks for the 64 bit version. And under Linux a 32 bit only program should be marked as this (and
usually this is done correctly - so another hint that this 64 bit binary was just forgotten - and macOS
is also supported in later versions so has to use 64 bit).

So after getting some info by the Devs/Publisher I will contact GOG about the situation.

Will put any further info here when I get it ...