Noob Dad here...
I have tried rebooting multiple times to try to get to "Recovery" (GRUB 2) by holding down "SHIFT" during boot. I am waiting until BIOS screen completes. Need to reset ADMIN password... son, also a noob, set-up initial PW and forgot it.
Single Ubuntu boot; not dual. No Windows; one Linux partition.
No joy! Your assistance is greatly appreciated.