Windows 10 won't boot after installing Ubuntu to a different drive

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  1. m4q
    Posts : 7
    Windows 10
    Thread Starter
       #21

    I'm finally back home. So, I created a 100mb FAT 32 partition on Disk 1, assigned the letter S and named it EFI with "Partition Tool", was about to use DiskPart to tranfers boot data to this new partition, but then I noticed that Disk 1 does not have a recovery partition as well. Should I create a "recovery" partition too? It's pretty easy to create partitions with this software, but am I going to be able to transfer recovery data the same way you guys suggested with DiskPart? If I won't able to transfer the recovery data, will Windows recognize it as the recovery partition and save new recovery data there? Thank you again.
    Windows 10 won't boot after installing Ubuntu to a different drive-147.png
    Disk #1 with new EFI partition.
      My Computer


  2. Posts : 17,349
    Windows 11 Pro
       #22

    You don't need the recovery partition. Going from your screenshot in post #21, the next step would be to make the S: partition a true EFI System Partition. Open a Command Prompt (Admin) or "Run As Administrator" Command Prompt, and enter the following commands:

    bcdboot D:\Windows /s S: /f ALL

    If that is successful, continue in the same command prompt:
    diskpart
    select disk 0
    list part
    select part # <- replace # with the actual number of your EFI System Partition (S: drive)
    remove letter=S
    set id=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
    exit
    exit

    Now you should be good to go.
      My Computer


  3. m4q
    Posts : 7
    Windows 10
    Thread Starter
       #23

    Did exactly what NavyLCDR said above and it's working again! Thank you everyone for helping me out, really appreciate!
      My Computer


  4. Posts : 17,349
    Windows 11 Pro
       #24

    Glad it worked! The missing recovery partition only gives you the menu functions of the advanced repair menu if you hold down the shift key and click on restart from the power button menu. That menu may very well be in a hidden Recovery folder on C: drive and still be functional. Even if it was in the recovery partition and is no longer there, you can get the same functions from booting from a Windows 10 USB flash drive and selecting the Repair options. I have custom Windows 10 installations on my computers, and none of them have the standard Windows 10 recovery partitions. My computers have second HDDs in them with a bootable partition that boots into Kyhi's Recovery Tools and also contains the standard Windows 10 installation files, so I have complete system recovery capabilities from the installed second HDD in case the primary SSD should fail or get corrupted.
      My Computer


  5. Posts : 4,594
    Windows 10 Pro
       #25

    m4q said:
    Did exactly what NavyLCDR said above and it's working again! Thank you everyone for helping me out, really appreciate!
    I told ya, that man knows his stuff :)
      My Computers


  6. Posts : 4,547
    Windows 11 Pro 64-bit
       #26

    Deleted.
      My Computer


 

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