I am not able to start the operating system. Whenever I try to start the operating system it shows the following error:file /boot/grub/i386-pc/normal.mod not foundEntering rescue mode... grub rescue> I have ubuntu on my pc along with windows 8.1. How can I resolve this problem?I tried installing Ubuntu 14.04 onto my computer which was preloaded with windows 8.1. My goal was to make this a dual boot.I primarily followed the instructions on this link: http://www.everydaylinuxuser.com/2014/05/install-ubuntu-1404-alongside-windows.html.I accidentally skipped step 5, which was turning off secure boot, and is most likely what led to my current error. Ubuntu installed on my computer but I was unable to run it past the live session which prompted me to try out Ubuntu and/or install it again. But now I can't even get there.In frustration, I removed my flash drive and that is when I arrived at this screen, which I can't seem to get out of. (can't boot into neither Ubuntu nor Windows)If helpful, entering the command 'ls' on the grub rescue mode prompt outputs: (hd0) (hd0,gpt 12) (hd0,gpt 11) (hd0,gpt 10) (hd0,gpt 9) (hd0,gpt 8) .... (hd0,gpt 2) (hd0,gpt 1)'set' outputs: cmdpath=(hd0) prefix=(hd0,gpt10)/boot/grub root=hd0,gpt10These are pretty much the only two commands that work (that I know of). I've tried things like, 'quit', 'exit', 'lsmod' (I saw this might be useful on a different post), but none have worked.
Installing Ubuntu 14.04--Grub Rescue Error after failing to turn off secure boot [SOLVED]
ubuntu;windows;dual boot;grub;uefi
So I just now was able to successfully make my laptop a dual boot. The way I got rid of the grub rescue prompt was actually by changing my boot mode from Legacy Mode to UEFI. I did this by booting into the bios menu when I turned on my computer by pressing f2 (for me). I then scrolled over to Boot and switched this under the Boot Mode option. This got rid of the grub rescue screen upon powering up my machine. When I turned it on, it took me into Windows. However, I was not given the option to choose Ubuntu or Windows. Rather, I went straight into Windows. My next step was to disable secure boot, since secure boot is a form of protection for your computer and does not allow you the option to choose operating systems (see  http://technet.microsoft.com/en-us/library/dn481258.aspx for more info on this).NOTE: the disable secure boot does not appear until after you switch to UEFI. I was now able to turn Secure Boot Off. The way to do this was also on the BIOS menu. I simply scrolled left to the Security tab (NOTICE: you should see an option for Secure Boot on the Bottom. You need not disable this, since my next instruction will disable it). I scrolled all the way down to Reset to Setup Mode and pressed enter. This Clears PK, disables Secure Boot (see for yourself on that screen) and enters Setup Mode. On a side note: I tried simply disabling Secure boot many times, saving it each time but this did not change anything when I restarted my computer (still booted to Windows automatically). After this, when I rebooted I had the option to choose Ubuntu or Windows (since Ubuntu was already installed). I did this on a Lenovo P400, so these steps may not be exact for all computers. Use your intuition where applicable. My understanding is that this whole UEFI thing is unique to new operating systems, including but not limited to Windows (8 and 8.1). Hope this works for you! 