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The system will get to the Plymouth 'ubuntu' screen, load load, all dots filled, switches over to LightDM, but wait! No LightDM. :I Just a blank screen with that white cursor. Can't switch out to tty1-6 - not sure if the Ctrl-Alt-F1 is disabled in 14.04 or if its literally just locked down. If I change any files, I have access to the filesystem from my Windows 8 partition. That's it. :/

I only changed a few things recently, but don't know if one was a cause. I switched to the Numix theme (from PPA), installed lm-sensors and psensor (ran all the I/O probes), Ubuntu Tweak, Pinta, and well, Team Fortress 2 on Steam. :P

I'm not new to Linux, but this has me stumped. Any help would be greatly appreciated. Thanks!

UPDATE I was just able to get into my desktop briefly. I booted Ubuntu. When the black screen froze, I hit Ctrl-Alt-Del. It rebooted. I plugged the second monitor in I had been using before the issue ever came about. Plymouth displayed on both. LightDM came up, displayed on both (it used to show only the ubuntu logo on the unfocused monitor though). I logged in just fine. Even ran some pending software updates. I logged out of the desktop though, and LightDM refused to show again. xP

UPDATE Got in again. It's been giving me an error (for a couple weeks actually). Didn't really think it was related...

sdb:6:0:0:0: [sdb] Assuming drive cache: write through
sdb:6:0:0:0: [sdb] Assuming drive cache: write through
sdb:6:0:0:0: [sdb] Assuming drive cache: write through

...but I put two-and-two together, took out the SD card I always leave in the slot, rebooted, and it started up just fine. I obviously ran here to give an answer, but had a feeling I should reboot just to make sure. Good thing. It didn't let me in the second time. Same black screen, white cursor. '-_-)

UPDATE I just went through recovery mode, just installed gdm and switched over to that as my DM. For the heck of it, I ran plymouth in debug. My plymouth debug log

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closed as off-topic by Warren Hill, bain, Mahesh, Sneetsher, Glutanimate Jul 7 at 15:51

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This describes a problem that can't be reproduced that seemingly went away on its own or was only relevant to a very specific period of time. It's off-topic as it's unlikely to help future readers." – bain, Mahesh, Sneetsher, Glutanimate
If this question can be reworded to fit the rules in the help center, please edit the question.

    
1  
Thanks!, but the solutions that did apply didn't work, and the rest didn't apply. I ended up just using the LiveCD to reinstall the OS fresh (-my home directory). It's fine now, so unfortunately I won't know what else could've been done. Dunno if the log does anybody any good, but I'd say its pretty much closed now. –  Kage Jun 9 at 4:50
    
this wasn't necessary, you did it too hurry, this is the problem that caused by video drivers, this can be done without re-installing the OS. But if everything is fine now, congrats then. –  JohnnyEnglish Jun 9 at 13:47