ACC error : The agent OS version (Linux Ubuntu 20) is currently not supported.SummaryWhen upgrading a previously installed agent from 2.8.2 to 3.0 we get below error: The agent OS version (Linux Ubuntu 20) is currently not supported. ReleaseSan DiegoInstructions"The agent OS version (xxx) is currently not supported." is worked out by finding the "os" value as an entry in the JSON object "upgradeRequirements", in the AgentUpgradeAjax script include. That specify which check definition to use. If you get an error for an OS/Linux distribution the release notes suggest is supported, then the AgentUpgradeAjax script include might not be the latest version, or some values were missed out. The following is the 2.10.1 list: Debian/Ubuntu: GNU/Linux 9GNU/Linux 10GNU/Linux 11Ubuntu 18Ubuntu 20Ubuntu 21 RedHat/CentOS: Linux Red Hat 7Linux Red Hat 8Linux CentOS 7Linux CentOS 8Linux SuSE 12Linux SuSE 15 In 2.10.2: "Supporting new OS Versions... CentOS Stream 8 and 9, RHEL 9" , 2.5.0: "New:OS Support – Amazon Linux 2 and Oracle Linux". not in that list. Confirmed: Some OS versions that the Installer has been tested with have not yet been tested for the Selective Upgrade. Agent Client Collector installation documents have added the Supported Operating System Distributions, For Tokyo and Utah, we added a condensed table of supported OS's. Ubuntu 20.04 LTS is listed as being supported on both the Tokyo and Utah pages. https://docs.servicenow.com/bundle/utah-it-operations-management/page/product/agent-client-collector/concept/acc-installation.html For San Diego https://docs.servicenow.com/bundle/sandiego-it-operations-management/page/product/agent-client-collector/concept/acc-installation.html