PROBLEM
When i try to launch the game I watch this error.
$ ./start.sh
Running Blade Runner (Spanish)
Starting ScummVM
/home/[user_name]/GOG Games/Blade Runner Spanish/game/scummvm/scummvm_x86_64: error while loading shared libraries: libSDL2_net-2.0.so.0: cannot open shared object file: No such file or directory
Done.

SOLUTION
Execute install this command in Ubuntu 18.04
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sudo apt-get install libsdl2-net-2.0-0
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After this the game will strat normally.

Thank you! I was tearing my hair out trying to figure out what library I was missing.

I have the same problem but I'm on Manjaro using pacman and would expect the command "sudo pacman -S libsdl2-net-2.0-0" to result in the same solution but the terminal returns "error: target not found: libsdl2-net-2.0-0".
Do you possibly have any advice for me? Thank you.

Hi, could you try this suggestion here:
https://ecuadorminingnews.com/install-sdl2_net/

Thank you. That got me one step further.
The next error was "libmad..." (forgot the exact message) not found. I could fix that with "sudo pacman -S libmad".
Then "libsndio.so.6.1" missing. "sudo pacman -S sndio" installed successfully but the error persisted. I used Manjaro Add/Remove Software to install "libsndio-61-compat" from AUR and got past that error.
Then "libcurl-gnutls.so.4" missing. Installed "libcurl3-gnutls" from AUR.
Then "libfluidsynth.so.1" missing. I installed nearly every package available in AUR that has the word "fluidsynth" in it but I can't get past this error.
Any further help would be greatly appreciated.

I've noticed that there's a thread in this forum about making Blade Runner work on Manjaro specifically, which may help with your issue:
https://www.gog.com/forum/blade_runner/get_it_running_on_manjaro_linux

Also, here's a quote from a gamingonlinux article that suggests a similar solution (creating a symbolic link) for fluidsynth's case at least:
"""
On Manjaro I did need to install some extra SDL2 packages like "sdl2_net", and additionally since GOG package for Ubuntu the library name for "libfluidsynth.so.1" from FluidSynth did not match up. Creating a link between what it wants and what the Arch package has will make it work. Like so:

ln -s /usr/lib/libfluidsynth.so.2.3.0 /usr/lib/libfluidsynth.so.1

Note: You will likely need "sudo" for admin rights, to create the link. There's probably other ways around it but that's quick and works to get you going. You could also just use a local install of ScummVM instead of their provided package.
"""
Source: https://www.gamingonlinux.com/articles/you-can-now-return-to-the-world-of-1997s-blade-runner-as-its-up-and-restored-on-gog.15622/page=2

Really thanks for sharing. I've faced exactly the same problem. Installed the missing lib and it worked.

On Arch, I also ran into the same trouble, but the issue is just the version of ScummVM that's included. The Arch install for ScummVM will run the game ("add new game"... just navigate to the installed /game folder and use that) It works perfectly fine. Odd. But the symbolic link is a more elegant solution, thank you!

Thank you, this helped (Linux Mint 19.3 here).

Yeah, unfortunately the included ScummVM is problematic. I didn't have this experience with other gog's ScummVM games. Installing my own ScummVM and adding /Blade Runner/game/data works for me.

Using ./play.it avoids this dependency issue, as it sets up the game to use the distribution-provided version of ScummVM instead of the one bundled with the GOG installer.