I upgraded my 14.04 to 14.10 via "sudo do-release-upgrade" without strange messages.
After rebooting and entering the password for the encrypted system partition in the graphical form, TTY7 keeps blank. I can use TTY1 to TTY6 without problems.
My machine is a Thinkpad T400 with Intel Chipset Graphics.
Update 1: Tried to reinstall the kernel (sudo apt-get install --reinstall linux-image-$(uname -r)), but get an error:
reinstallation of linux-image-3.13.0-37-generic is not possible, it cannot be downloaded
Update 2: Followed the instructions in (Statement) "Ubuntu 14.10 won't work because black screen" solution described here (sudo apt-get install --reinstall xserver-xorg-video-intel), but without success.
Update 3: By coincidence, some graphics appeared on screen (TTY7) after hitting the combination Super+SPACE, which is a shortcut for changing the keyboard layout. Seems like it should work, but doesn't?
Update 4: Tried the approach from Ubuntu 14.10 no GUI or term login (adding "init=/lib/systemd/systemd" to the boot parameters), but without success.
Update 5: Tried removing the package "xserver-xorg-video-nouveau", as suggested in http://ubuntuforums.org/showthread.php?t=2245436. No success... Also, that thread suggested downgrading "xserver-xorg-video-intel". Downloaded and compiled the trusty sources (https://launchpad.net/ubuntu/trusty/+source/xserver-xorg-video-intel/2:2.99.910-0ubuntu1.1/+files/xserver-xorg-video-intel_2.99.910.orig.tar.gz), but also no success.
Update 6: Sound is also broken.