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I know this question sort of has been answered elsewhere, notably, here: Install Ubuntu to Boot from Partition on external Hard Drive

except that i am having an error that i do not know what to do with.

I am getting a "Failed to unmount partitions" on "/cdrom" right after partitioning the usb hard drive.

I've googled this error without finding an accurate match, i have found errors related to cdrom on server editions of ubuntu except that the fix doesn't apply to me (no files to rename and path is different)

I have to admit i am not savvy enough with ubuntu to know how to troubleshoot this error.

Any suggestions?

Thank you.

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