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I'm running Ubuntu 14.10 with the system disk encrypted with luks. When I start the computer, it shows the Ubuntu logo and asks to enter the password to unlock the disk. However, I cannot enter the password. Nothing happens if I type the password and hit Enter. However, I can hit Ctrl + Alt + Del to restart the computer. The only way to start the computer at the moment is to use the recovery mode.

Any ideas?

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You mean you can not enter your pw, it says the pw is wrong or it behaves as if the pw was right (no warnings etc.) but does not proceed? – Byte Commander Jan 16 '15 at 7:34
    
I mean no other keyboard input has any effect than Ctrl + Alt + Del. If I type in the password and hit Enter, nothing happens as if the keyboard is not connected. – user254173 Jun 3 '15 at 7:05
up vote 18 down vote

I have the same problem. It seems to be an issue with Plymouth not capturing keyboard input, at this step in the boot process

Work Around: update boot parameters in /etc/default/grub and change splash to nosplash. After that you can run update-grub and you will get a console based password prompt instead of the Plymouth one. Not as pretty, but it's doesn't require gyrations to boot.

Diagnostic Synopsis: If I hit Ctrl + Alt + F1 then Ctrl + Alt + F7, the Plymouth graphic screen disappears and it brings me back to a black screen where I can see the text I type echoed, but it doesn't accept the input to unlock the drive.

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Omg, thank you so much. I know this is a little old, but after months of troubleshooting this finally resolved my issue. You are a godsend. – Camway Feb 13 '17 at 16:23
    
is there a bug report for this? – Qsiris Feb 23 '17 at 13:03
    
I had exactly the same problem with one of my PCs and that fixes it ! – Philippe Gaucher Apr 30 '17 at 3:11
    
Thanks, this was extremely useful. Extra thanks for adding the diagnostic synopsis. By the way, has this still not been fixed in Plymouth, 2+ years on? – st01 Nov 11 '17 at 23:56
up vote 1 down vote

I share the same problem.

I found the following solution: At splash screen it is not possible to enter the password. If I type ESC to display textual console, it is possible to unlock the disk with the password.

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protected by Community♦ Mar 26 '17 at 23:06

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