How Do You Install GitLab on Debian or Ubuntu Linux?

Problem scenario
You want to do deploy (install and configure) GitLab on a Debian Linux server.  What do you do?

1.  Get a Debian or Ubuntu Linux server with either 3.5 GB of RAM or at least 1.5 GB of RAM and 2 GB of virtual memory.  If you need to resize an AWS instance, see this posting.  If you need to resize a GCP instance, see this posting.  If you need directions for creating virtual memory (aka swap space), see this posting.

2.  Run these commands from the backend of the Linux server:

sudo apt-get -y update
sudo apt-get install -y curl openssh-server ca-certificates

sudo apt-get install -y postfix

# Choose "Ok" to the first prompt you see (your only option).
# Select the "Internet Site" option
# Accept the default options continually by pressing Enter to each one. In some cases there will be only one option anyway.

3.  Run this command:

curl | sudo bash

4.  Run a modified version of command.  Substitute x.x.x.x with the external IP address of your server or the URL you want to access via a web browser when the process is finished, append ":yyyy", with no quotes, to the "x.x.x.x" where yyyy is the non-default port you want GitLab to operate on:

sudo EXTERNAL_URL="http://x.x.x.x:yyyy" apt-get install gitlab-ee

5.  Go to the web UI.  You will be prompted to create a new password.  Remember this password.

6.  Log into the web UI.  For the user, use "root" with no quotes.  Use the password you entered in the step above.

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