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!
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1Are 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
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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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1If 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