I recently came across this November 2016 article.
I tried what they said and pressed the Enter button for 70 seconds and was able to get into some kind of black terminal screen. But I am so inexperienced that I don't know what it was exactly and I don't know if this is the vulnerability outlined in the article.
As the article suggested, I tried to add this command to the boot configuration, but it didn't work:
sed -i 's/GRUB_CMDLINE_LINUX_DEFAULT="/GRUB_CMDLINE_LINUX_DEFAULT="panic=5 /' /etc/default/grub grub-install
I am using Ubuntu 16.04 LTS with full disk encryption. I've looked around in this forum for a solution but didn't find anything specific to the apparently problem of accessing a LUKS encrypted partition.
Thanks for the help.
/boot
partition, which does not contain any confidential information; they do not get access to the encrypted data. They can get access to that partition anyway by booting a live session from any bootable medium.