Installed image on 32GB micro SD:
sudo ddrescue -D --force ubuntu-mate-16.04-desktop-armhf-raspberry-pi.img /dev/sdd Displays message indicating a crash but won't boot
Ubuntu mate will only run on a Pi 2 onwards so if you are trying this on a Pi 1 it won't work.
shasum -a 256 ubuntu-mate-16.04-desktop-armhf-raspberry-pi.img
Check the hash of your download to make sure it matches the ones given on the downsite site (may may have to look around for the right hash if you are using an older version). It might be a corrupt .img.
You could use
sudo dd if=ubuntu-mate-16.04-desktop-armhf-raspberry-pi.im of=/dev/sdd bs=4M to write the image. The Ubuntu Mate folk seem to suggest the
ddrescue method as preferred but I've tended towards regular dd, Can't see it making that much difference though. Make absolutely certain
/dev/sdd is your SD-Card mind :)
SD Card definitely healthy though right?