Thanks. Unfortunately that log is not helpful because it contains only
one boot done in recovery mode with modesetting disabled:

Apr 15 14:33:53 lance-desktop kernel: Command line:
BOOT_IMAGE=/boot/vmlinuz-5.0.0-11-generic
root=UUID=ddacea78-cdda-4236-94c3-4c4d9d3dad20 ro recovery nomodeset

Please reproduce the black screen problem once (ensuring that you are
not booting into recovery mode*), then reboot again once, and then run:

   journalctl -b-1 > prevboot.txt

to collect the log of the previous boot which had the problem, and send
us the file 'prevboot.txt'.

* To ensure you are not booting in recovery mode, as soon as the purple
screen appears tap Escape. Then search through the menus and choose a
kernel to boot that is not recovery mode.

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https://bugs.launchpad.net/bugs/1824588

Title:
  Ubuntu Disco boots to or logs out to black screen

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