I recently set up a Claude Code Organization https://www.whiteboardcoder.com/2026/03/claude-creating-account-and-setting-up.html [1]

And now I want to get Claude Code installed and running on Ubuntu 24.04

Installing

I found this install info at https://code.claude.com/docs/en/setup [2]
From your command line run this command

> curl -fsSL https://claude.ai/install.sh | bash

Success!

Now open a new terminal
And run this as a test

> claude --version

Let’s pull a simple test repo down from github to test it on.

> git clone git@github.com:TheAlgorithms/Python.git
> cd Python

Now start Claude

> claude

If this is your first time you need to do some setup.
Select style I am selecting 1.

Choose login. I have an API usage org setup so I am choosing 2.

It will attempt to open a web browser.
If it can’t it will post a url.

Open that URL.

Authorize

Copy this code.

Pastes in the code.

You get this little warning
press enter

Trust the code

We are up and running.

But…
I suspect that I am using my account vs my workspace.

Press ctrl+c twice in a row to exit.

Add API key

Grab your Workspace API key assuming you have it already set up.
And export it as a env in ~/.bashrc

> vi ~/.bashrc

And add this line (putting in your actual key)

export ANTHROPIC_API_KEY="sk-ant-api03-YourFullKeyHere..."

Source ~/.bashrc to grab it

> source ~/.bashrc

Double check to make sure its in the env variable

> env | egrep ANTH

Now run claude again

> claude

Neat it detected the key. If it’s the correct key select 1. And press enter.

Looks like because I logged in before directly I have a key conflict. I want to use the API key… So to fix that let me run claude /logout

Ctrl+c twice to get out then run

> claude /logout

Successful logout !

Start up claude again

> claude

Looks like I have to go through this again
That is not right …
Let me try something
Get out of claude

Something is not right…

Let me test the key itself

Running this curl command (Of course put your key in it)

> curl https://api.anthropic.com/v1/messages \
-H "x-api-key: sk-ant-REPLACE_WITH_YOUR_KEY" \
-H "anthropic-version: 2023-06-01" \
-H "content-type: application/json" \
-d '{
"model": "claude-sonnet-4-6",
"max_tokens": 1024,
"messages": [
{"role": "user", "content": "Hello, Claude!"}
]
}'