I tried to install Ubuntu on my Surface 3 tablet, and it went thru the install pretty good, but when it booted up from the install, it had this message "please unlock disk mmcblk0p3_crypt". I can't type anything, or select anything. I've tried powering off and booting up again, but no luck. What does this message mean, and how can I proceed?
I do not have a Surface 3, but there are many pages showing some instructions may help you.
how can I proceed?
If you have installed ubuntu with disk encryption, re-install the ubuntu disabling the disk encryption.
When your ubuntu boots the first time, install the linux kernel packages for Surface.
sudo add-apt-repository ppa:tigerite/kernel sudo apt-get update sudo apt-get upgrade sudo apt-get install linux-surface sudo apt-get dist-upgrade