Step 2: Install the Call of Duty 2 Server Prerequisites
The required dependencies for a CoD2 server can be installed with the following commands:
sudo dpkg –add-architecture i386
sudo apt-get update
sudo apt-get -y install libstdc++5:i386
However, the author notes that they are not 100% certain that these commands install every required dependency.
If the CoD2 server fails to start afterwards, it is recommended to install the Libcod dependencies described in Step 4 of this guide as well. These include additional required libraries and often resolve startup issues.