Ubuntu MATE boot too long (2.5 minutes)

I installed Ubuntu 16.04 LTS as my second OS.

When I choose Ubuntu at the boot menu, it takes around 2.5 minutes, whereas Windows 10 boots in around 30 seconds.
Also, when I choose to boot into Ubuntu, GRUB seems like it's glitching up or something because it hangs for 20 seconds or so.

See systemd-analyze screenshots below:

Here is startup.svg: