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Re: I made the bootable USB, but I have one issue.

You can get the Ubuntu file's checksum from the site from which you got the iso. The checksum is calculated from the iso and it's a pretty reliable way of seeing if there's an error in the download. Windows 10, like Linux, will generate a checksum, but the old versions of Windows will need a small program to do it: https://download.cnet.com/MD5-SHA-Checksum-Utility/3000-2092_4-10911445.html
You can get the Ubuntu file's checksum from the site from which you got the iso. The checksum is calculated from the iso and it's a pretty reliable way of seeing if there's an error in the download. Windows 10, like Linux, will generate a checksum, but the old versions of Windows will need a small program to do it: https://download.cnet.com/MD5-SHA-Checksum-Utility/3000-2092_4-10911445.html