Isolinux is missing or corrupt

Not really.

Apart from the number of the partition (for example /dev/sda1 etc.) everything else matters.

In your case, if you are already in Downloads folder and the usb flashdrive is /dev/sda, then:

sudo dd bs=4M if=EndeavourOS_Apollo_22_1.iso of=/dev/sda conv=fsync oflag=direct status=progress

edit:

Linux Mint should have a GUI USB Imagewriter preinstalled if I remember correctly. You might want to use that instead

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