Well, even the most broken ISO file can still be burned fine. It’s really important to check the file’s hash after download and ideally after burning, too.
See Q6:
https://ubuntu.com/tutorials/how-to-verify-ubuntu#1-overview
https://linuxconfig.org/how-to-verify-the-integrity-of-a-linux-distribution-iso-image
You can get it from any source, as long as the hashes match, in the end.
There are like a bajillion versions. You will have a lot to choose from.
The point is, that such a similar error usually appears, when something went wrong with the ISO file. If you verify the hashes match, usually such messages go away.