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Boot Order Workaround - CD-ROM Not in Dropdown

Good News!

The ISO is attached and boot disk is configured via API. The VM should boot from CD-ROM even if it doesn't show in the Web UI dropdown.

Solution: Test Boot Now

The boot order is already set via API (bootdisk=ide2). Try this:

  1. Start the VM (if not already running)
  2. Open Console tab
  3. Ubuntu installer should boot automatically!

If it boots from CD-ROM, you're done! The Web UI dropdown is just a display issue.

Option 2: Use BIOS Boot Menu (If Needed)

If VM doesn't boot from CD automatically:

  1. Start the VM
  2. Open Console
  3. Immediately press F12 (or F2, Delete, or ESC - depends on VM)
  4. Select "CD/DVD" or "ide2" from boot menu
  5. Ubuntu installer should start

Option 3: Set Boot Order in Web UI (Alternative Method)

If you want to set it in Web UI anyway:

  1. Options tab → Boot Order
  2. Look for a text input field (not just dropdown)
  3. Type: order=ide2;scsi0
  4. Or try: Just ide2
  5. Click OK

Some Proxmox versions have a text field where you can type the boot order directly.

Option 4: Verify Current Configuration

The API has already set:

  • ISO attached (ide2)
  • Boot disk = ide2
  • VM should boot from CD-ROM

Test it: Just start the VM and open Console. It should boot from the ISO.

Why CD-ROM Doesn't Show in Dropdown

Some Proxmox Web UI versions don't show CD-ROM in the boot order dropdown even when it's attached. This is a UI limitation, but the boot order is still set correctly via the API.

Verification

Current status (via API):

  • ISO attached: ide2=local:iso/ubuntu-24.04.3-live-server-amd64.iso
  • Boot disk set: bootdisk=ide2
  • VM should boot from CD-ROM

Just start the VM and check the Console!

Next Steps

  1. Start VM 100 (cloudflare-tunnel)
  2. Open Console
  3. If Ubuntu installer appears: Success! Proceed with installation
  4. If "No bootable disk": Use F12 boot menu method
  5. Repeat for VMs 101, 102, 103

Quick Test Command

After starting VM, check console. If Ubuntu installer appears, boot order is working!