UT & Nexus 4 black boot screen.
I tried to install Ubuntu Touch today on my Nexus 4 (mako)
Downloaded the 5 files, installed the CWM based recovery, wiped data and cache, even performed the factory reset.
Then I pushed both the zip files via adb as autoupdate.zip, each time rebooting.
Nothing I got a black screen.
Then I wiped again and pushed both files via adb, this time however I installed them manually each time rebooting back into the recovery.
Still nothing I tried installing UT about 5 times.
Seems to me like it's hit and miss with Ubuntu Touch, too bad I was really looking forward to trying it out.