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I installed ubuntu 18.04 to dual boot alongside windows, i made a root partition, a swap partition and an efi partition. I have fast boot and secure boot disabled, ubuntu is #1 in the bios boot manager, even if i hold f12 during startup and manually choose to boot into ubuntu the pc just doesn't care and boots into windows 10. Any help? This is the video: https://www.reddit.com/r/Ubuntu/comments/drpq7r/i_tried_dual_booting_ubuntu_alongside_windows_to/

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  • Please confirm your BIOS is configured with Legacy Boot disabled, CM Support disabled (if there is one in your BIOS), and Windows 8/10 Features disabled (if there is one in your BIOS). NOTE: Ever since late 2017, a Swap File in the same partition as root or home is preferred by Ubuntu's installation program. Before then, the Linux kernel has performance issues with swap files, but that was resolved > 2 years ago. If you will not use Hibernation in Ubuntu, you do not need a Swap Partition.
    – K7AAY
    Nov 4, 2019 at 23:40
  • Need more info. To start with, boot into Live Ubuntu, run command sudo parted -l and paste output into your question.
    – Paul Benson
    Nov 5, 2019 at 0:38

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You could try spamming Shift until you see GRUB is loading and then hold Shift until the GRUB menu loads. You also may want to spam your Esc key.

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Because neither Ubuntu nor Windows 10 is able to boot from the GRUB boot menu you need a tool that can repair the bootloaders of both OSs. Rescatux is a free bootable live CD/USB that can repair GRUB and the Windows bootloader. Rescatux has a graphical interface with a menu of operating system rescue tasks. If your hard disk has the MBR partitioning format, you can select the Restore Windows MBR (BETA) option to repair the Windows bootloader. If your computer has UEFI firmware, you can select among the UEFI boot options.

Boot options:

  • (>=0.41 beta 1) Update UEFI order
  • (>=0.41 beta 1) Create a new UEFI Boot entry
  • (>=0.41 beta 1) UEFI Partition Status
  • (>=0.41 beta 1) Fake Microsoft Windows UEFI
  • (>=0.41 beta 1) Hide Microsoft Windows UEFI
  • (>=0.41 beta 1) Reinstall Microsoft Windows EFI
  • (>=0.41 beta 1) Check UEFI Boot

GRUB options:

  • (>=0.40 beta 11) Easy GNU/Linux Boot Fix
  • Restore GRUB and GRUB2
  • (>=0.31 beta 4) Update any GRUB2 menu
  • Update Debian/Ubuntu GRUB menus

Windows options:

  • Restore Windows MBR (BETA)
  • Clear Windows passwords
  • (>=0.31 beta 4) Promote a Windows user to Administrator role
  • (>=0.41 beta 1) Reinstall Microsoft Windows EFI
  • (>=0.31 beta 4) Unlock Windows user

Password options:

  • Change GNU/Linux Password
  • Regenerate sudoers file
  • Clear Windows passwords

Expert tools:

  • Boot-Repair
  • GParted
  • OS-Uninstaller
  • Clean-Ubiquity
  • PhotoRec
  • TestDisk

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Rescapp is a nice wizard that will guide you through your rescue tasks.

Notes

  1. Remove the CMOS battery for 5 minutes or press the clear CMOS button if the computer has one to clear the CMOS settings back to the default settings before booting from the Rescatux live USB. That way the BIOS settings will not override the GRUB bootloader.

  2. You can also use a Boot-Repair live USB instead of Rescatux if you have one, but Rescatux is a more powerful tool than Boot-Repair when Windows is installed alongside Ubuntu.

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