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Few days ago I installed ubuntu 13.04 on a new machine without big issues. Today, after the boot, I have this situation:

  • grub correctly loaded and normal boot
  • normal purple screen with red dots
  • instead of normal login screen I have a black screen with an almost unresponsive mouse pointer and keyboard (they are really slow and they react with a latency of a couple of seconds)
  • Hitting multiple times Ctrl+Alt+F1 I can reach a console and there operate normally (no latency anymore)
  • I tried to restore the desktop environment giving unity to the console but it cannot start.

The only "suspect" actions that I could have done yesterday are an upgrade from the repositories and maybe, having left a usb-key plugged.

After a lot of trial-and-error, the only workaround that I found effective is to launch ubuntu in recovery mode and then, from the list, select the first field: recover normal boot (or something similar). I really cannot understand why in this way stuffs are working fine.

Do you have any idea of what the heck is going on? Thanks a lot in advance :D

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Could be many things. I've personally been having problems with kernel updates not installing correctly (causing something similar to what you describe). When I get into tty terminal, I try update & upgrade and sudo apt-get install -f. Another few restarts... –  Brandon Bertelsen May 9 '13 at 13:45
    
I had a similar problem I created a bootable 13.04 usb stick using unetbootin and after a successful install. I then rebooted and I had no keyboard no mouse on start-up, or my system would not boot at all and it would get stuck on booting the usb drivers. I re-made a new bootable usb directly in ubuntu following these instructions and reinstalled and everything worked. ubuntu.com/download/desktop/create-a-usb-stick-on-ubuntu Old versions of unetbootin may not be copying files over again –  Rick T Jun 12 '13 at 14:49
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