Invisible Disk Encryption Password Request (Possible bug?)

[bluelizard]

8)

I don't use lvm/luks (disk encryption) but I'm going to try to help. If I Google the phrase ubuntu 16.04 lvm luks password prompt I get lots of results that look like they could help.

I didn't find a direct solution, but it gave me the hint I needed to figure this out. LUKS is working fine, but Plymouth is covering the password prompt. Once the password is entered, it displays "Cryptsetup: (drivename) set up successfully" on top of the background, but it's hard to see with the default splash background. I tried making the background transparent, setting the background colors to 0 (black/transparent) in Plymouth's config file and updating initramfs, but the prompt is still not visible. I'm not sure if Plymouth is covering the prompt or pushing it off the screen.

What does work is shutting off the splash screen in GRUB.

Open a terminal window, then open etc/default/grub in leafpad as root:

Code:

sudo leafpad /etc/default/grub

Find this line:

Code:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Remove "splash." "quiet" can be left in.

Code:

GRUB_CMDLINE_LINUX_DEFAULT="quiet"

Save the file and close Leafpad. Update GRUB:

Code:

sudo update-grub2

Now it will boot without the splash screen and the LUKS password prompt shows up as plain text. Enter the password, and it continues booting normally.