Hello, the installer is working, but when you try to start the game, nothing :(
Then you try to launch it from a terminal.
It says some libs are missing : libssl.so.1.0.0 and libcrypto.so.1.0.0
The easy way is to find them in another place (in google earth folder for me, or on some internet lib providers)
Then you make a link with this command :
sudo ln -s 'complete_path_to_the_lib' '/lib/'
for each lib missing
The game will find them and will work fine.

Yes, absolutely.

On a safest way, on Ubuntu:
wget http://security.ubuntu.com/ubuntu/pool/main/o/openssl1.0/libssl1.0.0_1.0.2n-1ubuntu5.6_amd64.deb
sudo apt install ./libssl1.0.0_1.0.2n-1ubuntu5.6_amd64.deb

on a safest way to a b0rked system that is

Baldur's Gate fails to launch on Debian 11, launcher script gives the message:
/BaldursGate: error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory

I think there's actually a CVE out on that version that did billions in damage a few years ago and Debian evidently just decided to kill it with fire for all time.

The repositories are now offline, locating an old binary took some searching. Debian mirrors that still host old ISOs was where I finally found the old binary.

Debian Jessie Netinstall for X64:

cdimage/archive/8.11.0/amd64/iso-cd/debian-8.11.0-amd64-netinst.iso

Rather than do things the proper way, I just opened the ISO with ark, searched for libssl, and then extracted the DEB file:

libssl1.0.0_1.0.1t-1+deb8u8_amd64.deb

I then opened that with ark as well, and extracted both libcrypt.so.1.0.0 , libssl.so.1.0.0, and the openssl-1.0.0 directory with support libraries.

Then I copied them to a directory in my search path "/usr/lib/x86_64-linux-gnu/"

That is not the proper way to do things, they should live in an application specific location in the application library path, but I'm not wearing my developer hat today so it doesn't need to be done correctly.