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Developer Documents Frustrating OPNsense VM Setup Failures on Proxmox

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A developer shared a detailed account of repeated failures while attempting to install OPNsense in a Proxmox virtual machine. Outdated tutorials recommending only 8GB of disk space caused the first install to fail, as OPNsense's swap partition alone now requires that much space, necessitating at least 20–30GB. Subsequent attempts were derailed by issues including the installer ISO not being unmounted before reboot, leftover virtual hard disks interfering with the boot process, and the VM persistently defaulting to PXE network boot instead of booting from the virtual drive. Misleading online suggestions about disabling 'Pre-Enroll keys' for Secure Boot proved irrelevant since the VM was using SeaBIOS, not UEFI. The experience highlighted how quickly outdated documentation and subtle Proxmox VM configuration steps can compound into a lengthy troubleshooting ordeal.

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