Dear Users,

i am using Ubuntu 16.04 on my workstation. Lately I was running my simulations. All at a sudden my system was jammed only with my mouse pointer moving. Then automatically it restarted stating displaying "Grub rescue"

i have noticed other related issues and tried set root command and that still end up in error. Any suggestions will be of great help.

In your case it appears that there is only a minor issue. Before proceeding to correct it through a grub command this is the most passive solution you may try:

--Run a live CD on the CD drive
--Open a terminal there and then issue
If fsck requests you to run it without the switch "-a" then comply it, or reissue the command this way
it shall run with automatic "yes" to save your thinking time (this is risky though but I regularly use it because I don't pretend to know the language of the file system checker.)

Hope that helps. Good luck.

m.m.