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# Download the installation package.
wget https://aka.ms/azcmagent -O ~/Install_linux_azcmagent.sh

# Install the Azure Connected Machine agent.
bash ~/Install_linux_azcmagent.sh

Note: Debian is not supported.

Sources:

Connect hybrid machines to Azure using a deployment script - Azure Arc
In this article, you learn how to install the agent and connect machines to Azure by using Azure Arc-enabled servers using the deployment script you create in the Azure portal.