Re: I am running Win 7 on one HD (C) and the other (E) is blank and formatted........
Drive letters are a convention used by Windows; plus, they aren't actually "drives", instead, they are "partitions".
The only way to install Ubuntu to a "drive" is using Wubi -- which has been discontinued largely due to the problems associated with UEFI.
Since you can't install Ubuntu to an NTFS partition, you should remove that partition and use "something else" in the Ubuntu installer to install in the unallocated spot.
Ubuntu 20.04, Mint 19.10; MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.
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