Screen Tearing After Kubuntu Upgrade 15.10 -> 16.04
Solution 1:
Solution For The Tearing Problem
As /u/ropid suggested, I tried adding this
__GL_YIELD="USLEEP"
KWIN_TRIPLE_BUFFER=0
KWIN_USE_BUFFER_AGE=0
to /etc/environment.
This fixed the tearing issue for me.
Solution For The Encryption Problem
I found this link, which suggested to do the following:
sudo nano /etc/default/grub
Then replace
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
with
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
This disabled the GUI password prompt. The CLI version successfully detects my keyboard.