10

I almost know nothing about coding in Ubuntu. I am currently dual booting ubuntu 16.04 LTS and Windows 10. Everything was fine . But today an error occured saying

"can't find filesystem"

and then grub rescue begins . After searching for some time I have found out solution that tells to do these:

ls
set prefix=(hd0,msdos5)/boot/grub
insmod normal
normal

I know that ls is listing harddrive partitions(let me know if I am wrong) .Then(in set prefix) I need to select a partition . There came a error when I selected msdos5. After some try I selected msdos6. Then it ran . But the problem is that from another solution to this problem I wrote this code:

set boot=(hd0,msdos6)

I think I messed up . Probably , it involves which partition of the harddisks is going to boot .Now, my laptop is running after writing this code and every time I turn on the laptop the boot stuck at the beginning showing the same error & I need to write the code every time I need to run the laptop . How can I solve this issue? I probably also need to know the partition which is booting (msdos*) & I don't know how to find that.

Utshaw
  • 555

2 Answers2

19

I got a solution for this type of problem if grub rescue> prompt occurs in booting time and you have to write a code like:

grub rescue> ls
grub rescue> set boot=(hd0,msdos*)
grub rescue> set prefix=(hd0,msdos*)/boot/grub
grub rescue> insmod normal
grub rescue> normal

After boot Linux/Ubuntu based OS will load then open a terminal and write the command:

useranf@ ~ $ sudo update-grub

then type this command:

useranf@ ~ $ sudo grub-install /dev/sda

after these operation now finally reboot your system.

muru
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deepak bundela
  • 206
1

In the above answer by deepak bundela, i think the following line needs to be corrected:

grub rescue> set boot=(hd0,msdos*)

to:

grub rescue> set root=(hd0,msdos*)

(am repeating the * as bundela put it so as not to distract from the real issue)

i was unable to find a grub environment variable called boot, and as far as i recall it has always been set root=()

i am somewhat confused by all the commenters who said that it worked on their distros. did they do a set boot or a set root?

at the grub rescue> prompt, if one just types set it lists all the env variables that have been set. in all my grub rescue adventures, i've never seen the boot env variable being listed.

Ram Sambamurthy
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