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How delete root login password
download the
GParted live boot iso and create a CD or USB Stick
reboot server and boot from iso
the GParted window show the partitions on the server

/dev/sda5 is the first esxi partition
open a terminal
enter following command to change on root:
sudo -s
create a subdir in the mount dir /mnt:
mkdir /mnt/esxi
mount sda5 (or maybe a other partition):
mount /dev/sda5 /mnt/esxi
find the state.tgz in mounted dir:
ls /mnt/esxi/st*