After restart my laptop I couldn't access the Ubuntu partition, simply I am directly adress to Windows without the possibility to choose between Ubuntu, Ubuntu Recovery Mode, Windows ....From Windows I used DiskInternals Linux Reader and I can confirm that all my Ubuntu files are there. I attached pictures.  . I red few links around such as this and this but they did not help me. So the question is, Can I re-mount Ubuntu FROM Windows to be able to access it again?I have Window 10 Home 64bit. Many thanks.
Re-mounting Ubuntu from Windows?
ubuntu;mount;windows
Reboot the system into rescue mode, from your installation disc.And then install grub.update-grubgrub-install <device name of your ubuntu installation>