Ubuntu: Cant boot back into windows10 cant install Ubuntu


HELP Cant boot back into windows10 cant install Ubuntu I decided I wanted to try to dual boot windows 10 and Ubuntu 16.04, so I followed This Tutorial, everything was going smoothly until I got this:

Force UEFI Installation? This machines's firmware has started this installer in UEFI mode but it looks like there maybe existing operating systems already installed using BIOS compatibility mode, If you continue to install Debian in UEFI mode,it might be difficult to reboot into any BIOS-mode operating system.

I decided to force the installation. Continuing on, everything seemed okay, I went through the wizard and the installation began smoothly. Until, near the end of the installation I get an error that pops up saying

"The 'grub-efi-amd64-signed' package failed to install into /target/. Without the GRUB boot load, the installed system will not boot."

I click "okay" and send the error report as that is the only option. Now I am stuck in "trying Ubuntu without installing". When I boot, the grub menu only has the "Try Ubuntu without installing", "Install Ubuntu", and some system setting options.

So I can't get back into windows, and I can't install Ubuntu. I would really just like to get back to windows. Any advice would be amazing. Thanks.

PS. I have tried boot repair, and it did not seem to work. Here is the boot repair pastebin.


First of all, you might want to ensure that the data on the hard disk is secure. So, boot into a live session of Ubuntu through "Try Ubuntu without installing" and check out the drives.

Next, try re-installing Ubuntu the right way as explained here.


You might be able to boot to Windows after editing the UEFI settings. Enter to the UEFI Settings menu by selecting that System Settings option from the grub menu, then try to find a setting related to the boot drive, and change that to the partition Windows is installed on. I cannot make a step by step tutorial because firmwares differ from a machine to another so the UEFI Settings menu does.

This will only work if the Windows partition was kept untouched during the installation of Ubuntu, and all of the data on it -most importantly system files- are healthy.

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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