If it is a new Pi you probably need to unzip the file and it should be a disc image, then you need to move it to a micro SD card with something like Lili (Linux Live image writer) which creates a bootable card from it.
You might be able to make a bootable USB stick with Lili and install from the stick, which you can do for a desktop machine but I have never looked at doing it for Ubuntu Mate.
Last edited by The_bluester; 24-01-2019 at 02:36 PM.
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