One Hour One Life Forums

You'll want a VM, or other server to install your Debian 10.
Follow the install process.  For me, I chose no Desktop, enabled SSH, Print, and Web servers.
Now that you have the server installed, make sure you can talk to it from your computer by using Putty to connect to it.
If you don't know the IP address, you can go to the console and type in "ip addr" and press enter

For those wanting an unfucked version of OHOL before 50 nerf hammers came down, follow this guide:
First you will want to select a version that you enjoyed playing from the github at https://github.com/jasonrohrer

There's three repositories you'll need to look at, but generally search through the release notes and choose your favorite release.  For me, I chose Version 312.

You'll need minorGems v312.  Remember the release date.  For mine, it was Feb 28th.

Next, download OneLifeData7.  Your version won't be listed there.  Look for the same date of release.  For mine, it was version 313.  If you don't do this, your server will see random objects floating around like you ate mushrooms... except this effect will be forever.

Finally, download OneLife with the same release date.

Use SCP to transfer those files to your new Debian 10 server.
SSH to your server and perform the following commands:

su
<enter password>
apt install build-essential unzip
<press Yes>
unzip those 3 files into your home directory.
Go back to your favorite SCP program and rename the folders to:

instead of minorGems-OneLife_Vxxx rename to just minorGems (you will fail the compiling if you don't)
instead of OneLifeData7-OneLife_Vxxx rename to just OneLifeData7  (You'll get a segmentation fault if you don't)
rename OneLife-OneLife_vxxx to just OneLife

back to SSH:

rm *.zip
cd OneLife/server
./configure 1     
make

After the make is complete, type this in:

ln -s ../../OneLifeData7/objects .
ln -s ../../OneLifeData7/transitions .
ln -s ../../OneLifeData7/categories .
ln -s ../../OneLifeData7/tutorialMaps .
ln -s ../../OneLifeData7/dataVersionNumber.txt .

You shouldn't have errors after this.

now test your server with ./OneLifeServer:

# ./OneLifeServer
Local epoch time  = 21600
GMT epoch time  = 0

Server starting up

Now, you'll want to download the correct client version as your server.  For me, I downloaded version 312. 
After launching your client, click Settings and type in your server's IP address.

You can also edit a few settings such as if you want to force your Eve spawn to a certain place:

OneLife/server/settings/forceEveLocation.ini -->  change from 0 to 1
OneLife/server/settings/forceEveLocationX.ini --> change to the X position to spawn at
OneLife/server/settings/forceEveLocationY.ini --> change to the Y position to spawn at.

I do this after I've placed my first camp to build a city.  People could argue that a home marker would fix it, but my children like to pick things up so that home marker gets destroyed quickly.

If you want to keep the server running after you close SSH, use the screen command.  You'll need to install it first.

apt install screen
screen
press Space a few times
screen
./OneLifeServer

Now you can close your SSH session.
After connecting again, you can type in "screen -ls" to list active screen sessions.
type screen -r xxxx x's for the screen number to resume the session.