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[Lawrence Weetman <contact@xxxxxxxxxxxxxxxxxxx>]

I am also having this issue (approx daily). I'm running Ubuntu 14.04.2,
with multiple monitors and an nvidia graphics card.

I'm afraid that I can't provide any logs/traces right now, but I can
corroborate the thing about having to unlock twice. I can perhaps
provide some more vague-but-useful information, though! I have a custom
lockscreen background (unfortunately, I can't remember what method I
used to set that). When this bug happens, the lock screen changes to the
default Ubuntu background - the same as when I initially login after
starting the PC. Once I've logged into this lockscreen, the screen goes
black for a fraction of a second then it returns with the usual
lockscreen with the custom background image. Once I've logged into that
lockscreen, I am back at my desktop but with all apps closed.

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https://bugs.launchpad.net/bugs/1451613

Title:
  Unity/compiz crashes when locking screen

Status in Unity:
  New
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  Since a recent update (around April 29th), sometimes (approximately once a day) when I lock my computer screen (CTRL+L or using system menu) the computer freeze for a while (2 to 30 seconds) before showing the login screen.
  Then when I try to unlock the screen I need to enter my password twice (with no error message after the first try).
  Once logged in, all applications are closed. Uptime is still running (since no reboot) and services too (with no interruption).

  Looking at the apport.log file (see attached) it seems that when I try
  to lock the screen, compiz crashes.

  I've attached the compiz crash file too (_usr_bin_compiz.1000.crash)
  but without the 100Mo data of base64 core dumb…

  
  I'm using Ubuntu 14.04 AMD64.
  Graphics drivers: nvidia-331.113 (tested)

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