SQL Server 2017 is installed as part of Symantec Endpoint Manager (SEPM) 14.3 RU1 and above version with SQL Server Express instance of database. The installation of SQL Server Express 2017 was stuck at 2% on "Install_SqlSupport_Cpu64_Action" for hours and not proceeding.
SEPM 14.3 RU1 or later
SQL Server Express version
Run 'SQLSUPPORT.msi' from SQL server installation folder while the setup is stuck on "Install_SQLSupport_CPU64_Action".
Then execute the following command through Command Prompt (cmd) with "Run as Administrator" option:
taskkill /F /FI "SERVICES eq msiserver"
SQL server setup will proceed after this and complete.