Ubuntu black screen after update

Symptom:

You have recently updated packages on your Ubuntu distribution and are seeing a black screen post the Plymouth splash screen. The alternate consoles are not enabled. But the system responds to Ctrl-Alt-Del.

Cause:

This could mean that the update of the Xserver packages did not happen correctly. The update removes the following packages

xserver-xorg-video-ati
xserver-xorg-video-tdfx
xserver-xorg-video-trident
xserver-xorg-video-fbdev
xserver-xorg-video-mga
xserver-xorg-video-r128
xserver-xorg-video-vesa
xserver-xorg-video-siliconmotion
xserver-xorg-video-mach64
xserver-xorg-video-sis
xserver-xorg-video-s3
xserver-xorg-video-savage
xserver-xorg-video-nouveau
xserver-xorg-video-neomagic
xserver-xorg-video-sisusb
xserver-xorg-video-radeon
xserver-xorg-video-cirrus
xserver-xorg-video-intel

Solution:

This can be corrected by entering recovery mode with networking enabled and typing the following command -

sudo apt-get -f install

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