It appears the graphics driver isn't working because you have told the
kernel to disable support for KMS ("nomodeset"):

[    0.000000] Kernel command line:
BOOT_IMAGE=/boot/vmlinuz-4.15.0-24-generic
root=UUID=ae28586a-e989-4c32-9ab5-ceee8bacba22 ro recovery nomodeset

To fix this please edit /etc/default/grub and remove "nomodeset". Then
run:

  sudo update-initramfs

and reboot.

** Tags added: radeon

** Summary changed:

- screen
+ [radeon] screen problems

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

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

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https://bugs.launchpad.net/bugs/1781384

Title:
  [radeon] screen problems

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