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Mako Boots To Blank Screen After OTA-4

 

I got the OTA-4 (I should be on Mako/stable, IIRC) which installed and seemed to restart OK on my Nexus 4, and I was looking at putting my ssh scripts on there.  I created a bin directory in my home path and added
PATH=$PATH:~/bin
to my .pam_environment file, but after this didn't seem to include it in the path I thought I'd reboot as I believe that change won't kick in until I next log in.  However, when I restarted, I got the rotating Ubuntu logo then the screen just went black. Pressing the power button seemed to back-light the blank screen, to a slightly lighter shade of black, but then nothing else happens.  Forcing a power-off and then restarting does the same.  I remembered something about the app-armour config needing to be rebuilt, so left it for about 20 mins (though I was sure this would have been done during the upgrade) but it was still the same.
I then booted into recovery mode and wiped the cache partition, but this still didn't work.
Next I tried re-running ubuntu-device-flash, this seemed to detect the phone OK, but the main part of the image push seems to fail:-
11.86 MB / 297.83 MB [>_________________________________] 3.98 % 3.95 MB/s 1m12s2015/06/19 01:38:54 error pushing: 

I've tried another cache wipe but that push still fails.  Ideally, I'd like to avoid wiping my existing home contents - anything I can try (or can I at least extract my home contents before trying the factory reset from the recovery partition).
Cheers
MH