Oh, damn, forgot that I put this up here. It was the same after
switching to 18.04, but then I fixed it. Turns out that problems loading
the graphics driver during boot are so common, that there's a grub
option that disables it:

GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"

This needs to be set and Grub rebuilt. That should give you a visible
command-line prompt for the drive password. After inputting that, the
boot of the OS proceeds normally.

Since this is a good workaround (built into Grub, even), I'll close the
ticket.

It would be great if this was more discoverable, though.

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https://bugs.launchpad.net/bugs/1731068

Title:
  With NVIDIA proprietary drivers, initial login screan appears only on
  mouse movement

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