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I had a dual boot system with windows 10 and PopOS (Linux) . Both on seperate SSDs. The Linux SSD was hard drive encrypted. I wanted to change the linux distro to Ubuntu. When prompted to 'install Ubuntu alongside Windows 10' i couldn't choose the Linux SSD as installation device. I thought it had something to do with the harddrive encryption so i went to disconnect the windows drive and installed Ubuntu on the linux drive to overwrite the harddrive encryption. The Problem now is, that i don't have the Windows boot loader anymore. When i try to reinstall Ubuntu i can't install it alongside windows because it isn't detected and i have now Ubuntu and Windows on seperate drives but can't acces Windows. I couldn't find any solution that doesn't need a new installation of windows to get them together in GRUB. Thanks for any help!

Rc_
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    Are both installs UEFI/gpt or both very old BIOS/MBR? Microsoft has required vendors to install in UEFI boot mode to gpt partitioned drives since 2012. So most hardware is UEFI. But how you boot install media UEFI or BIOS/CSM/Legacy is then how it installs. If hardware is UEFI, then both installs should be UEFI. If not sure how you installed: [ -d /sys/firmware/efi ] && echo EFI || echo Legacy – oldfred Feb 03 '23 at 20:07
  • FYI: You didn't provide any Ubuntu product/release details, so we can provide specific advice on your installation due to lack of specific details (the release tells us the age of your software stack allowing us to better guess potential issues) – guiverc Feb 03 '23 at 21:03
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    If Ubuntu was installed in the same BIOS or UEFI mode Windows uses run sudo update-grub – C.S.Cameron Feb 04 '23 at 04:29

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