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I am using the product 5.25" Tray-Less SATA Hot-Swap Hard for 3.5"HDD Hard Disk off / on Button found here at the front of my Asus PC (2013 model) with Ubuntu 14.04. I set successfully bios that you can boot from the hot-swap system.

However, I started to receive recurrent grub rescue errors after two month of use. I can fix the problem for one startup by pieces of instructions in the thread Grub rescue problem after deleting Ubuntu partition but it occurs after every shut down. Error at every startup

error: no such device: 48d470cc-7ad3-46e9-9646-622e16319f71
Entering rescue mode...

where I do the following which solves the thing only for one startup, after which the error comes again

grub rescue> ls
(hd0) (hd0,msdos5) (hd0,msdos1)
grub rescue> ls (hd0,msdos5)
(hd0,msdos5): Filesystem is unknown. 
grub rescue> ls (hd0,msdos1)
(hd0,msdos1): Filesystem is ext2. 
grub rescue> ls (hd0)
(hd0>: Filesystem is unknown. 
grub rescue> set root=(hd0,msdos1)
grub rescue> set prefix=(hd0,msdos1)/boot/grub
grub rescue> insmod normal
grub rescue> normal

The state of the OS may affect the recurrent grub rescue mode. I am receiving now many (2-3) internal errors from the system when keeping the system alive. I have received them few also before. I sent each time a report about the issue to developers with logs. However, no proceeding has happened with it.

How can you understand recurrent grub rescue mode in Ubuntu 14.04?

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1 Answer 1

Reset to default
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These instructions are for regular BIOS machines and are not for newer EFI machines.

Did you already run sudo update-grub after booting up Ubuntu? Running this command should update everything.

If not, you may need to reinstall grub to the MBR. Run the following command to do so:

sudo grub-install /dev/sda

Then, run sudo update-grub again for good measure.

Also, make sure grub is installing to the correct MBR on the correct disk. You can install grub to any MBR on any disk (even a USB drive) by altering the command above so keep that in mind.

Please post any errors.

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  • No errors. It startups now without grub rescue mode. I will let you know if I see any internal errors and/or related errors later. Thank you for fast answer!
    – Léo Léopold Hertz 준영
    Mar 9, 2016 at 18:19

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