In order to install Unturned (version 3.21.16) for your Hostry server running Debian 10 operating system, you need to follow the following guide:

Installation

To get started (this step always comes first), you need to update your system:

yum update -y

Then install the following packages. This is necessary for Unturned to work properly. This can be done as follows:

yum install screen unzip git -y

Then you need to add i386 architecture support:

yum --enablerepo=base-i386 --disablerepo=base-x86_64 
yum update

After successful installation, you should install the libraries that are listed below:

yum install --enablerepo=base-i386 --disablerepo=base-x86_64  lib32stdc++6 mono-runtime mono-devel libmono-cil-dev mono-reference-assemblies-2.0 libc6-dev.i386 -y

Downloading server files

Next, download the server files (with wget support). Do it like this:

wget https://github.com/Unturned/server/releases/download/4.2/unturned-linux-dedicated.tar.gz
wget https://github.com/Horsuna/Unturned/releases/download/1/Managed.zip

Unpack the server files

tar -zxvf unturned-linux-dedicated.tar.gz

Then, after successful unpacking, you need to move the files to your server folder:

mv Managed.zip unturned-bin/Unturned_Data/

Now go to the Unturned_Data directory:

cd unturned-bin/Unturned_Data/

This is followed by unpacking the archive files:

unzip Managed.zip

Start your newly installed untouched server 3.21.16:

cd ../
chmod +x dedicated.sh
./dedicated.sh

Installing AdminCommands

AdminCommands is very important to install and will be designed to give you some control over your server since it lacks a console.

To do this, you will need to be in the directory for this part. Use git to get a clone of the mod files for your server

git clone https://github.com/Horsuna/Unturned.git
cd Unturned

Make sure the files have already been cloned correctly. Use ls for this. The result that will be displayed for you will look something like this:

ls
AdminCommands.dll  Assembly-CSharp.dll  ModLoader.dll  README.md

Move ModLoader and AdminCommands to server files:

mv * ../Unturned_Data/Managed/

Create a new directory for the AdminCommands mod:

mkdir mods

Then the final step is to move the AmdinCommands mods of your mod directories

mv AdminCommands.dll mods/

At this point, the installation process can be considered complete!