I installed VyOS for the first time today. I ran into a small issue during install. The hard disk had a GPT layout. The VyOS install (install image) completed but after reboot, no bootloader was found. I repeated the install, same problem. I then booted with GRML and performed 'wipefs -a /dev/sda' to get rid of all remaining labels and filesystem signatures. I then did another install of VyOS and it succesfully booted.
Perhaps an automated wipefs -a would be a good idea when choosing the Auto install option?