It appears the problem is that you have
partially/unsuccessfully/manually installed the Nvidia graphics driver
but it's no longer installed and it has left the 'nomodeset' flag in
your kernel command line:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-24-generic root=UUID
=47ee8f4e-ddca-4b1f-beeb-159611ec343b ro nomodeset

which will prevent the default 'nouveau' graphics driver from working
properly.

To fix this you should edit your /etc/default/grub and remove
'nomodeset'. Then run 'sudo update-initramfs' and reboot. That will
allow the nouveau driver to work properly.

If that doesn't fully solve the problem then you can later also try the 
official nvidia driver by running:
  sudo apt install nvidia-driver-390

** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)

** Changed in: xorg-server (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1781125

Title:
  Display drivers are not Avaialble

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