Proxmox Cheat Sheet

README.md

Migrate a Proxmox VM from SeaBIOS to OVMF (UEFI)

• Under the VM's Hardware tab, change BIOS from Default (SeaBIOS) to OVMF (UEFI) in the Proxmox web UI
• Click Add at the top and select EFI Disk. Select a location and click OK.
• Boot the VM using Boot Repair Disk. Alternatively, boot any live CD and install the Boot Repair tool. Instructions for Ubuntu here: https://help.ubuntu.com/community/Boot-Repair
• Use Gparted or your favourite partitioning tool to create an EFI partition. Note: You may need to resize your disk and adjust your partition layout.
• Run the Boot Repair tool and choose the recommended option. Follow the instructions

NB: This works on a disk partitioned using MBR.

Relevant reading

• https://wiki.debian.org/GrubEFIReinstall

GPT to MBR

• https://askubuntu.com/questions/1314111/convert-mbr-partition-to-gpt-without-data-loss
• https://serverfault.com/questions/963178/how-do-i-convert-my-linux-disk-from-mbr-to-gpt-with-uefi/963179
• https://gist.github.com/cjyar/cd5ea76a8692516767672ffc2883df92