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Most questions and answers I’ve seen so far (like this one) are addressing solely booting problems after removing one OS from systems with a single SSD/HDD, but multiple partitions.

In my case, each OS has its own dedicated SSD and I assume that, after disconnecting the first Win10 SSD, the second Ubuntu SSD (which has been installed afterwards) does not boot maybe because of missing MBR.

Is there an way to fix booting on Ubuntu SSD alone, without OS reinstall?

Teodor Tite
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  • Have you installed Ubuntu in BIOS mode or UEFI mode? When you have both the OS'es.. How are you selecting Windows? Via boot menu or grub? – PRATAP Oct 03 '18 at 14:10
  • Thanks for asking. I’m selecting via grub. I don’t remember for sure how I’ve installed it, but I think it was BIOS mode. But I’ll check it and come back. – Teodor Tite Oct 03 '18 at 20:01
  • can you type sudo update-grub command in terminal and post the output in your question please. – PRATAP Oct 03 '18 at 21:42
  • can you open Gparted from your Ubuntu and see /boot or /boot/efi is in both the devices or in one device like this? https://i.stack.imgur.com/sBofP.png – PRATAP Oct 04 '18 at 07:23
  • output of sudo update-grub: Generating grub configuration file ... Found linux image: /boot/vmlinuz-4.15.0-36-generic Found initrd image: /boot/initrd.img-4.15.0-36-generic Found linux image: /boot/vmlinuz-4.15.0-34-generic Found initrd image: /boot/initrd.img-4.15.0-34-generic ... ... ... ... ... Found linux image: /boot/vmlinuz-4.13.0-36-generic Found initrd image: /boot/initrd.img-4.13.0-36-generic Found memtest86+ image: /boot/memtest86+.elf Found memtest86+ image: /boot/memtest86+.bin Found Windows 10 (loader) on /dev/sda1 done – Teodor Tite Oct 04 '18 at 11:24
  • Hi, Seems that Windows10 and Ubuntu both are installed in BIOS mode. Can you attach the gparted image also to proceed further. – PRATAP Oct 04 '18 at 11:44
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    https://askubuntu.com/a/1076564/739431 this answer is good. if you can access your hdd where Windows is present, just unplug it and reboot. system should boot to ubuntu. if not, plug the hdd back reboot and follow the answer in this comment. it probably should not make any issues.. in case, for safety, keep the bootable USB of your present Ubuntu version ready to reinstall the grub on SSD where Ubuntu is present. – PRATAP Oct 04 '18 at 11:52
  • Thanks for the link. I've already tried to unplug Win SSD, but system did not boot on Ubuntu. Regarding GParted: /dev/sdb1 (Ubuntu SSD) has mount point "/" and no flags; /dev/sda1 (Win SSD) has boot flag, but mounting point column is not shown at all. – Teodor Tite Oct 04 '18 at 12:33
  • OK.. Then when you are on Ubuntu.. Install grub on SSD with that answer. – PRATAP Oct 04 '18 at 12:41
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    @PRATAP it worked as described in the second answer (legacy BIOS => just install grub on Ubuntu SSD) from the question you’ve sent me. You may answer it and I’ll mark it as the solution – Teodor Tite Oct 09 '18 at 11:40
  • Hi, thanks for informing me about your success. You may up vote the answer from the linked question in the comment section above which helped you. Thank you once gain. – PRATAP Oct 09 '18 at 11:58
  • Can you try boot priority as windows SSD first. So that it will directly take you to Windows10. Later Change Boot Priority to Ubuntu SSD. It confirms that in future even if you remove Ubuntu SSD system will directly boot to Windows. – PRATAP Oct 09 '18 at 12:10
  • Thanks, +1 for the answer. Unfortunately I’ve already erased the Win10 SSD, right after removing it from the PC – Teodor Tite Oct 10 '18 at 12:21

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