Grub Command Prompt after Windows 10 Update and reboot

I am running a Fedora 27 / Windows 10 dual boot setup on a Dell XPS 13 8360 laptop. I recently booted Windows 10 to work with some MS Word documents and (foolishly) allowed the system to update. After restarting the computer I was presented the grub shell (i.e. 'grub>' rather than the usual boot menu where I can select a Fedora kernel or Windows 10. How do I restore the boot configuration I used previously so I can again load Fedora? Based on what I have read so far it seems that perhaps the boot loader is not looking in the right places for the Fedora partition. Until now the Fedora experience has been brilliant. I use linux mostly for some specific geoscience work so I am not a very technical user at this point..so apologies if this is unclear or has been answered elsewhere. Thanks!

-- EDIT: Fixed! Here are the steps.

1.) Download YUMI tool (https://www.pendrivelinux.com/yumi-multiboot-usb-creator/)

2.) Download the Rescatux utility (https://www.supergrubdisk.org/rescatux/)

3.) Burn the Rescatux ISO to a USB Drive as Debian Live (FAT32) image using YUMI

4.) Boot the USB and launch the Rescatux app

5.) Select the 'Easy GNU/Linux' Fix option > run > choose your linux partition and hard drive

6.) Reboot and load Fedora, run the following terminal commands:

Then reboot with no USB stick, and edit the boot entry ('e' at the GRUB menu') and change 'linux16' and 'initrd16' to 'linuxefi' and 'initrdefi' respectively

readme.md

Grub2Win is a tool that lets you boot grub2 from your PC's EFI firmware or MBR. It supports Windows 10, Windows 8, Windows 7, Vista and XP. Download this simple Windows program and instructions that help you get grub2 booting quickly.

All the files for Grub2Win reside on the Windows C: drive. On EFI systems, five small modules are copied to your EFI partition. You don't have to depend on the availability of any Linux partition to boot your computer.

Grub2 supports extremely large disks (over 40 TB) and GPT partitions allowing you to have many OS images on a single physical disk drive. Grub2 also supports search, advanced scripting and many partition types. Supported filesystems include Btrfs, ext4, ext3, ext2, NTFS, Fat and Mac hfsplus. Booting from CD and USB is also supported by grub2.

Boot time help and messages can be displayed in 30 major languages.

This software modifies low level boot code. Make sure you have proper backups of your boot drive and EFI partition. Note that all Grub2Win executables are digitally signed to ensure that they are genuine.

• Download the grub2win.zip file from SourceForge and unzip it.

• Run the unzipped file setup.exe. This will require administrator access.

• Setup will download the most current Grub2Win modules and start the installation. Follow the prompts to select the drive where the grub2 product directory will be installed (usually C:)

• Once the setup program has completed successfully, a Delete the setup files checkbox will appear. The setup files are no longer needed. Check the box if you want the setup program to clean up these files.

• If your machine is running EFI firmware, disable the 'Secure Boot' parameter in your firmware settings. This step is not required for machines running BIOS firmware.

1. Click on the Grub2Win desktop shortcut or go to the C:grub2 directory and run grub2win.exe. This will require administrator access.

2. If your PC is currently booted in EFI mode, the program sets your machine's firmware to perform a one-time test boot of Grub2Win EFI. This will happen the next time your machine is booted. If the test boot is successful, you may either click the 'Set EFI Firmware Boot Order' button to place Grub2Win at the top of the firmware chain or go your machine's firmware menu to set the boot order.

3. The program will prompt you for your graphics preference, Windows boot timeout and grub timeout. You can also set the Grub2 language. The defaults should work fine, but you can change them if desired. Now click 'Manage Boot Menu'.

4. Add the partitions you want Grub to display at boot time. Detailed instructions will be found by clicking Help.

5. Now click Apply to return to the main Grub2Win screen. When you are satisfied with the options, click OK. Grub2Win will now generate a customized C:grub2grub.cfg file with the systems and options you have selected.

6. Shut down and re-boot your machine. On BIOS systems, you can choose to boot either Windows or the Grub2Win menu. On EFI systems, the Grub2Win menu will appear immediately. You can now use the Grub2Win menu to select the OS you would like to boot.

You can run Grub2Win as often as you like to add, change or remove the systems on your boot menu. Many items, including Linux boot parms, icons, timeouts and partition addresses can be tailored.Your choices will preserved across multiple runs.

If you encounter any errors during installation or while running Grub2Win, please open a topic on the discussion board here:

I would appreciate the opportunity to address any errors before you post a review.

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Good luck and enjoy!

drummerdp