I was trying to remove Windows and switch to Zorin full time, but something went wrong. The systems were on separate drives, and I am not sure which EFI partition Zorin used. How should I approach recovery?
How can I recover Zorin after messing up a Windows dual boot?
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!check+the~coatpocket
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Stop changing partitions for now. If there are files you care about, boot a live USB and copy them to a separate drive before trying repairs. A full partition image can also be useful if you have enough space.
Once the data is safe, check what is still present with lsblk -f. Share the output and describe what happens when you try to boot, including any error message. The repair depends on whether this is just a boot problem or whether the Zorin partition was changed too.
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The EFI partition and the Linux system partition do not have to be on the same drive. Zorin could have been using an EFI partition on the Windows drive even if Zorin itself was on the other one.
If that EFI partition is still intact, check the firmware boot menu for a Zorin or Ubuntu entry. A changed boot order can look like a broken installation. If the EFI files or entry are gone but the Zorin partition is intact, reinstalling GRUB to an EFI partition may be enough. Check the partition layout first rather than guessing which disk to use.
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If the installation itself is badly damaged, a fresh Zorin install may be simpler than piecing it back together. Back up your home files and, if possible, save a list of installed packages first. Then double-check the target drive in the installer so you do not erase the backup or another drive by mistake.
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quietly.in_transit:
Also, finding two EFI partitions does not establish which one was actually used. The mount information and boot entries are more useful clues.