How to get Dungeon Souls working on Ubuntu 24.04:

Dungeon Souls is a 32-bit application:

file ~/GOG Games/Dungeon Souls/game/runner

...results in output...

runner: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux.so.2 ...

1. If not done before, enable 32-bit libraries:

sudo dpkg --add-architecture i386
sudo apt update

2. Install most 32-bit libraries required by Dungeon Souls:

sudo apt install libc6:i386 libstdc++6:i386 libgl1:i386 libglu1-mesa:i386 libx11-6:i386 libxrandr2:i386 libopenal1:i386

3. Download 32-bit OpenSSL 1.0 deb package to the Downloads folder:

cd ~/Downloads
wget security.ubuntu.com/ubuntu/pool/main/o/openssl1.0/libssl1.0.0_1.0.2n-1ubuntu5.13_i386.deb

4. Follow my comments in the below GOG forum topic to safely install the two require OpenSSL 1.0 files for the game:

https://www.gog.com/forum/dungeon_souls/linux_error_while_loading_shared_libraries

Big thanks to GOG user V4V for the original OpenSSL 1.0 solution, we greatly appreciate it!

Good luck and enjoy!