Windows 10 dual boot.

Help with issues regarding installation of Debian

Windows 10 dual boot.

Postby jam7755 » 2019-08-03 03:32

Hi debian users. If this has been addressed in another thread then please provide me with a link to it. I am new to Debian and I currently have a PC with Windows 10 and ubuntu. I want to replace Ubuntu with Debian. Can I just throw the installation media in and have it overwrite the partition on the drive that is for ubuntu? It is a UEFI system and I believe the disk has been formatted as GPT. If there is any other information you need to better help you help me please let me know.
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Re: Windows 10 dual boot.

Postby ruwolf » 2019-08-03 05:01

You can install Debian on partition, where Ubuntu was, of course.
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Re: Windows 10 dual boot.

Postby 4D696B65 » 2019-08-03 12:04

Use manual partitioning in the installer and write over all the buntu stuff reformatting as you go.
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Re: Windows 10 dual boot.

Postby Head_on_a_Stick » 2019-08-03 14:00

Don't reformat the EFI system partition, it contains the Windows EFI loader.
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Re: Windows 10 dual boot.

Postby jam7755 » 2019-08-05 01:29

Well, I went about trying to do what was mentioned and messed up along the way. So, after trying a number of things I threw my hands up in the air and re-installed Windows 10. It was installed in UEFI mode. I then ran the Debian installation and long story short Debian was working. Then the Windows updates came along and now the machine does not boot into GRUB but rather just goes into Windows. I looked at the setting for my motherboard and the boot order only lists the DVD drive and windows boot manager. Before the updates ran I could also see linux as an option to boot into in the UEFI/BIOS. For the CSM device control the options are set to "UEFI" or "UEFI first". Fast boot has been disabled too. I am stumped and don't know what to do. Any help will be appreciated.
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Re: Windows 10 dual boot.

Postby Head_on_a_Stick » 2019-08-05 14:28

Try this command from an Administrator prompt in PowerShell:
Code: Select all
bcdedit /set "{bootmgr}" path "\EFI\debian\shimx64.efi"
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Re: Windows 10 dual boot.

Postby jam7755 » 2019-08-07 02:08

That worked. Thanks again head_on_a_stick. AFter doing more research into this it seems as though this has happened to others as well. From what I have read the best option may be to just get another drive and run Debian off of that because with major Windows updates it wants to eat up space used by Linux.
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