Dan Norton composed on 2017-11-29 13:07 (UTC-0500):
After POST, the following appears:
[...]
PXE-E53: No boot filename received
PXE-MOF: Exiting PXE ROM.
ERROR:No boot disk has been detected or the disk has failed.
It tries to PXE boot because it finds no bootable storage device:
there is no
active partition, or no boot code in the MBR sector of the device
that you
expect to boot. Installing Grub to a partition leaves the MBR
untouched, so it
might not yet contain anything other than partition data. The
partitioner I use
installs MBR code automatically. The one in the installer may have
needed to
have this step explicitly asked for. It can be added post-install
manually. 'man
install-mbr'.
Isn't that because the primary is not mounted to /boot?
Mounting happens well after the point you have reached.