I am having an issue with Ubuntu 16.04, and Proxmox's KVM noVNC console. I am not getting a login prompt, and it was working prior to doing updates. I have tried adding many flags to the grub boot prompt, and have had no luck on getting a prompt within the noVNC console. The VM's are utilizing Proxmox, but this issue is isolated to the recent updates on Ubuntu 16.04.
relay1:~ $ uname -r
4.4.0-96-generic
GRUB_CMDLINE_LINUX_DEFAULT="text" or GRUB_CMDLINE_LINUX_DEFAULT="nomodeset" or GRUB_CMDLINE_LINUX_DEFAULT="console=ttys0".
relay1:~ $ uname -r
4.4.0-96-generic
GRUB_CMDLINE_LINUX_DEFAULT="text" or GRUB_CMDLINE_LINUX_DEFAULT="nomodeset" or GRUB_CMDLINE_LINUX_DEFAULT="console=ttys0".