The error message "Unsupported returned from shimx64-cloudlinux.efi" typically occurs during the boot process of a system running CloudLinux when there is an issue with Secure Boot or UEFI firmware compatibility.

Here are some steps you can take to address this issue:

1. Disable Secure Boot:

   • Enter your computer's UEFI/BIOS settings.
   • Locate the Secure Boot option and disable it.
   • Save changes and exit.

2. Update UEFI Firmware/BIOS:

   • Check if there's an updated UEFI firmware or BIOS available for your computer. Installing the latest firmware may resolve compatibility issues.

3. Verify Boot Order:

   • Ensure that the boot order is correctly configured in the UEFI/BIOS settings. The boot order should prioritize the correct boot device.

4. Reinstall or Repair Boot Loader:

   • Boot from a CloudLinux installation or recovery media and reinstall or repair the boot loader.

5. Check for Corrupted Boot Files:

   • There might be corrupted or missing boot files. You can try to repair them using the CloudLinux installation media or recovery tools.

6. Contact CloudLinux Support:

   • If none of the above steps work, it's a good idea to reach out to CloudLinux support. They may have specific troubleshooting steps or solutions for your particular situation.

7. Consider Professional Assistance:

   • If you're not comfortable with advanced system configuration, consider seeking help from a professional or CloudLinux support.

Remember, when making changes to UEFI/BIOS settings, always proceed with caution, and if you're unsure about a setting, consult your computer's documentation or seek expert advice. Additionally, ensure that you have backups of critical data before making any major changes to your system.