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I installed ubuntu a long time ago along side with windows 10, on an 240gb ssd, I have another 1TB HDD that I split into 2 partitions. One for ubuntu and one for windows.

Today I wanted to delete windows permanently so I formatted the partition that has windows on it .

I restarted the laptop but then noticed the it's still there on the dual boot menu .

So I formatted the 1TB incase there are some boot files there , but nothing changed.

I formatted all the partitions and reinstalled Ubuntu, and I still have the same problem.

Any suggestions or solutions?

Michael Samer
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    You may be seeing UEFI boot entries which you can remove with efibootmgr. And may need to remove /EFI/Microsoft folder in ESP, or UEFI may add entry again. UEFI usually finds Windows but not other systems in ESP. https://askubuntu.com/questions/794725/can-i-remove-windows-boot-manager-from-dedicated-ubuntu-computer – oldfred Jan 28 '20 at 04:07
  • I saw your comments too late , i tried again to install ubuntu and now I have another error it says Executing 'grub-install/dev/sda' failed fatal error – Michael Samer Jan 28 '20 at 04:19
  • @MichaelSamer Have you seen this question? – mchid Jan 28 '20 at 04:48
  • @MichaelSamer Also, according to here: "Mistery is actually solved. We had to create a small EFI partition on the drives for the UEFI" – mchid Jan 28 '20 at 04:50
  • @MichaelSamer Also here is another question with answers to the same error. – mchid Jan 28 '20 at 04:52
  • @MichaelSamer Make sure that /dev/sda is the correct disk (even if /dev/sda was the correct disk when Ubuntu was installed). Sometimes during installation, the disks are named differently and the installation USB is sometimes /dev/sda. Running commands like blkid and lsblk can help you determine which disk is what. – mchid Jan 28 '20 at 04:59
  • I guess the answer may depend on if you have a UEFI system or not. – mchid Jan 28 '20 at 05:02
  • If you tried to reinstall in BIOS/Legacy/CSM boot mode and do not have a required bios_grub partition you get a grub install error. But if UEFI, it should install into ESP that Windows is using. Unless ESP is now corrupt and needs chkdsk from Windows or dosfsck from Linux. – oldfred Jan 28 '20 at 14:49

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If the "dual boot" menu is grub and you formatted the 1TB after you reinstalled Ubuntu, then you need to update grub by running the following command:

sudo update-grub
mchid
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  • There is another problem now , it says Executing 'grub-install/dev/sda' failed this is a fatal error.. I was trying to install ubuntu again – Michael Samer Jan 28 '20 at 04:18
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Thank you all for your efforts, I managed to solve this problem by entering the BIOS and changing the settings to default then changed the boot to legacy. and saved it. then everything worked fine.

Michael Samer
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Use grub-customizer to delete, change boot menu https://itsfoss.com/grub-customizer-ubuntu/

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