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To convert a .qcow2 disk image to .vdi format, you can use VBoxManage, a command-line tool included with VirtualBox. This tool allows you to convert disk images between different formats, including converting .qcow2 to .vdi.

Steps to Convert QCOW2 to VDI:

1. Install VirtualBox: Ensure you have VirtualBox installed on your system. If not, install it using the package manager for your system.

2. Locate the .qcow2 file: Ensure you know the path to the .qcow2 file you want to convert (e.g., Fedora-Server-KVM-41-1.4.x86_64.qcow2).

3. Open a terminal and run the following command to convert the file:

   VBoxManage convertfromraw /path/to/Fedora-Server-KVM-41-1.4.x86_64.qcow2 /path/to/Fedora-Server-KVM-41-1.4.x86_64.vdi --format VDI
   

   Replace /path/to/ with the actual path to your .qcow2 file and where you want the .vdi file to be saved.

Explanation of Command:

• convertfromraw: Tells VBoxManage to convert a raw disk image (like .qcow2) to another format.
• /path/to/Fedora-Server-KVM-41-1.4.x86_64.qcow2: The input .qcow2 file path.
• /path/to/Fedora-Server-KVM-41-1.4.x86_64.vdi: The output .vdi file path.
• --format VDI: Specifies that the output format should be .vdi.

4. Verify Conversion: Once the command completes, check the output directory to ensure that the .vdi file was created.

This should convert your .qcow2 image to the .vdi format, and you can use the .vdi file in VirtualBox for your VM.