Blank VNC screen on Ubuntu 16 KVM VM

Symptoms 

  VM is booted successfully and the SSH connection is fine but the VNC is showing a blank screen with '/dev/vda1: clean' error. Here is a example image.

Here is the /etc/default/grub output.

# grep GRUB_CMDLINE_LINUX_DEFAULT /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Cause

  Splash kernel parameter of the VM is causing the issue.

Resolution

 Splash kernel parameter should be removed from /etc/default/grub file from the VM, Here are the instructions.

1.   Access the VM via SSH

   # ssh root@10.0.0.1 -p22

2.  Edit the /etc/default/grub file using nano editor

   # nano /etc/default/grub

3. Change the below entry

   GRUB_CMDLINE_LINUX_DEFAULT="splash quiet"

   to

   GRUB_CMDLINE_LINUX_DEFAULT=""

4. Run this command on the VM.

   # update-grub

5. Reboot the VM and access the VNC.