It's hard to edit partition table in virtual machine when host thinks that sectors are 4k
and vm thinks they are 512 bytes. fdisk --sector-size 512 doesn't seem to work, so only
solution is to boot something inside vm to produce original hardware configuration.


cd /boot

wget http://download.grml.org/grml96-small_2017.05.iso

root@r1u28:/home/dpavlin# gnt-cluster copyfile /boot/grml96-small_2017.05.iso

# force boot from cdrom

root@r1u28:/home/dpavlin# gnt-instance modify -H kernel_path=,initrd_path=,boot_order=cdrom,cdrom_image_path=/boot/grml96-small_2017.05.iso armbian


# reboot, connect with vnc and fix system
root@r1u28:/home/dpavlin# gnt-instance reboot armbian

root@r1u28:/home/dpavlin# /srv/gnt-info/gnt-vnc.sh armbian
ssh -L 11032:127.0.0.1:11032 r1u30.gnt.ffzg.hr
vncviewer localhost:5132


# remove cdrom, restore boot from disk
root@r1u28:/home/dpavlin# gnt-instance modify -H kernel_path=,initrd_path=,boot_order=disk,cdrom_image_path= armbian

# restore kernel
root@r1u28:/home/dpavlin# gnt-instance modify -H initrd_path=/boot/initrd.img-4.9.0-0.bpo.6-amd64,kernel_path=/boot/vmlinuz-4.9.0-0.bpo.6-amd64 armbian