# Manually installing SSM Agent on Ubuntu Server instances
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In most cases, the Amazon Machine Images (AMIs) for Ubuntu Server that are provided by Amazon come with Amazon Systems Manager Agent (SSM Agent) preinstalled by default. For more information, see [Find AMIs with the SSM Agent preinstalled](ami-preinstalled-agent.md).

In the event that SSM Agent isn’t preinstalled on a new Ubuntu Server instance, or if you need to manually reinstall the agent, use the information in this section to help you.

**Before you begin**  
Before you install SSM Agent on an Ubuntu Server instance, note the following:
+ For important information that applies to installation of SSM Agent on all Linux-based operating systems, see [Manually installing and uninstalling SSM Agent on EC2 instances for Linux](manually-install-ssm-agent-linux.md).

**Topics**
+ [Install SSM Agent on Ubuntu Server 18.04, 20.04, 22.04 LTS, 23.10, 24.04 LTS, 24.0, and 25.04](agent-install-ubuntu-64-snap.md)