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?

  • 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 3 '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 3 '18 at 20:01
  • can you type sudo update-grub command in terminal and post the output in your question please. – PRATAP Oct 3 '18 at 21:42
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    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 4 '18 at 11:52
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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 9 '18 at 11:40

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