Hi 
We have tried more tested and verified,so far still not resolved this issue and 
but we have  workaround them commented "# set vt_handoff=vt.handoff=7"in 
grub.cfg ,It would can switch straight tty1.however,Do you known what's mean 
about gfxmode ? 
This issue always happened in PXE OS intaller  
function gfxmode {
        set gfxpayload="${1}"
        if [ "${1}" = "keep" ]; then
               # set vt_handoff=vt.handoff=7
        else
                set vt_handoff=
        fi

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https://bugs.launchpad.net/bugs/1646277

Title:
  Xenial server 16.04.x will have a black screen after PXE installation

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