Changing Ubuntu Screen Resolution in a Hyper-V VM

1. Open Terminal
2. Type: sudo vi /etc/default/grub
3. Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT, and add video=hyperv_fb:[the resolution you want]. The resolution I want is 1280x720. So my line ends up looking like this: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=hyperv_fb:1280x720"
4. Write the changes and quit vi.
5. Run: sudo update-grub
6. Reboot the virtual machine