Same problem on fresh install of encrypted lvm root with lvm swap of ubuntu 15.10 with amd graphics using open source amd. Work around seems to be revise /etc/default/grub to: GRUB_CMDLINE_LINUX_DEFAULT="" GRUB_CMDLINE_LINUX="quiet splash" followed by "sudo update-grub2" and "sudo update-initramfs -u" and "sudo grub-install /dev/sda"
This causes /boot/grub/grub.cfg to change the linux line to end in quiet splash linux /vmlinuz-4.2.0-22-generic.efi.signed root=/dev/mapper/vg-root ro quiet splash I wonder if the normal line ending of $vt_handoff may be the problem. I don't know what causes $vt_handoff to appear or even how to permanently remove it. hth -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1386005 Title: Password not accepted graphical boot for encrypted root system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1386005/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs