The main problem is I don't know what I am doing. First problem is my laptop with grub, Ubuntu and win10. I installed all a year or so ago and all worked well. A problem of a gray screen prevents seeing any display, but my pushing some keys and waiting i can sometimes get Ubuntu or win10 to open. I have another computer with a similar or same start up problem.
Can anyone offer some idea how to restore the start up? Thank you.
