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I downloaded Ubuntu 11.04 and it was working fine until I started tweaking compiz and rebooted. It took 3 to 4 minutes to boot up. When I press enter at the boot menu, there is a black screen with something flickering on the top left corner, which is normal, but for me the black screen stays for 4 to 5 mins. It is driving me crazy. Please explain your answer as I am not the terminal stuff.

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start with looking at your 'dmesg' output after bootup. It shows '/var/log/dmesg' which records the timestamps with logs as your system comes up. – nik Jun 2 '11 at 2:47
also on the os selection screen (grub) press e (edit) and remove the words 'quiet' and 'splash' from the list of options, then try booting. this will might show you what your computer is doing for that extra time. – thomas michael wallace Jun 2 '11 at 7:56

you can try to trace down the issue by installing bootchart available in repos.

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I'm on 11.10 with nvidia-current drivers. From my boot chart I've found out that booting into Unity 3D lasted 1:12.98 min while booting into Unity 2D took 0:38.66 min.

So I decided to look if some processes related to nVidia differ in both boots. And indeed I found out that nvidia-settings process was mentioned proc_ps.log in such proportion:

  • 66 times for Unity 3D and
  • 21 times for Unity 2D.

That lead me to conclusion that disabling nvidia-settings may improve boot performance. So I did sudo chmod a-x /usr/bin/nvidia-settings and the next boot in Unity 3D took the same 37 seconds (0:37.76) as with Unity 2D.

For sure it is not the solution, but at least a direction to look.

Hope this helps.

P.S. Make sure you know what are you doing while dealing with system files.

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