Changing the screen resolution in Hyper-V virtual machines running Linux OS turns to be a well known problem. Moreover, depending on the guest OS, the solution is different. We’ve already demonstrated how to change the screen resolution in CentOS and Red Hat Hyper-V Virtual Machines in the following video 
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In this short video, we demonstrate how to change the screen resolution in Ubuntu Hyper-V Virtual Machines. For your convenience, we provide the commands that we are using in the video:
# Use “sudoedit” to modify the “/etc/default/grub” file
# for the Microsoft Hyper-V Synthetic Video Frame Buffer driver
sudoedit /etc/default/grub
# Modify the “GRUB_CMDLINE_LINUX_DEFAULT” line passing the video argument with the required resolution
# for the Microsoft Hyper-V Synthetic Video Frame Buffer driver
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash video=hyperv_fb:1024×768″
# Apply the changes to the grub.cfg
sudo update-grub
# A reboot is required to apply the changes:
reboot
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