Yes, this does seem to be a duplicate of https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1359689.
I tried their suggested workaround and it worked for me, or at least it now boots in text mode and prompts for the password successfully every boot. For posterity sake, here was the fix/workaround required: $ sudo nano /etc/default/grub Include the following parameter GRUB_GFXPAYLOAD_LINUX=wxh $ sudo update-grub -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1375435 Title: Black screen instead of password prompt for boot encryption To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1375435/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
