Appliance Installer Error: "An unknown error has occured"
| KB ID: | 4789 |
| Product: | Veeam Backup & Replication | 13 |
| Published: | 2025-11-10 |
| Last Modified: | 2025-11-10 |
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Challenge
When installing a Veeam Infrastructure Appliance on a physical or virtual machine using a bootable USB device created from the JeOS ISO file, the following error occurs:
An unknown error has occurred
Cause
The following methods for creating a bootable USB drive from the JeOS ISO have been known to cause problems:
- Using Rufus with "Write in ISO Image mode."
- Creating a bootable USB with Ventoy.
- Other third-party bootable USB creation tools that don't write the image directly to the USB drive.
Note: Any method for making a bootable USB drive from the JeOS ISO other than the recommended Rufus "Write in DD Image mode," has not been tested or supported.
Solution
The recommended procedure for creating a bootable USB is documented in the User Guide.
It is recommended to use Rufus, and when prompted, select the non-default option to Write in DD Image mode:
Alternatively, instead of booting from a USB drive:
- For physical machines, IPMI or BMC solutions that support remote ISO mounting can be used.
Example: Supermicro's Implementation or Dell's PowerEdge iDRAC - For virtual machines, the hypervisor's standard boot from ISO methods can be used.
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