I wanted to reinstall Ubuntu from the hard drive. I followed the instructions from the official site to install grub and move the Ubuntu iso in the grub folder.
After rebooting, the grub> prompt shows up.
ls shows:
hd0, lvm/ubuntu--vg-root, lvm/ubuntu--vg-swap_1
but there is no /dev/sda1 in hd0 nor in --vg-root
How to fix this? What can be done to boot Ubuntu?