Writing UbuntuMate image

[Wade Smart]

I have a old laptop with Mate 15 and I need to update it.
I installed M15 originally with unetbootin (pretty sure at least)
but that is not working. I tried using gnome disk like the instructions
on the site say by clicking on Restore Disk Image. The Unetbootin
gets an error saying no OS present and on the other a message quickly
flashes saying  isoxxxx.bin missing.. not sure what it actually says
because it flashes so fast.  This laptop has no cd otherwise I would just
do that.

For anyone who has installed it - any suggestions?
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Linux since June 2005