Grub boot options for netifnames should be consistent between the live build image, and the installed image. Add the current live build options 'netifnames=0 biosdevname=0' to the grub setup for the installed image; both can be reverted later if predictable interface names are adopted. Note that 'biosdevname=0' may be redundant following:
https://github.com/vyos/vyatta-cfg-system/commit/c728fd8b53fefe363999354a99fd749b359feb72