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I had HDD where I had Ubuntu 18.04 installed and I installed Ubuntu 19.10 on M2 ssd. everything was working perfectly. I planned to replace HDD with another m.2 SSD. I did. after that when i booted my laptop it can't boot GRUB bootloader. so my guess is that, GRUB was installed in that HDD Which i replaced. so what is the solution? should i replace old hdd and do something to install grub in my m.2 ssd?

K7AAY
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ukasha sohail
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1 Answers1

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Return the HDD with the original GRUB bootloader.

Once it boots again, find its location, typically in the ESP if your PC uses UEFI; if not, typically it is in the MBR.

To confirm, open a terminal and run sudo lsblk /dev/sda and repeat for every other drive device on the system. The partition with /boot or /boot/efi is where the bootloader is now.

Now, run sudo grub-install /dev/sdX where sdX is the SSD you want to have GRUB live on. Some SSDs aren't named with the sd convention; that's why we check first, as some have names starting with nvm . For more detail, see http://manpages.ubuntu.com/manpages/bionic/man8/grub-install.8.html

K7AAY
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    and is it normal that GRUB bootloader loads default OS (which is selected by default after 5 seconds) faster and other OS (which we have to manually select) slower? – ukasha sohail Feb 25 '20 at 19:07
  • a) That's the subject for a different question, unless the non-default OS does not load at all or takes more than double the time required by the default. b) I looked in https://www.gnu.org/software/grub/manual/grub/grub.html , https://www.dedoimedo.com/computers/grub-2.html , https://help.ubuntu.com/community/Grub2 , and searched here, and found no mention of slower booting all other things being equal. . – K7AAY Feb 25 '20 at 19:14