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I'm running Ubuntu 12.04 in Virtualbox under a Linux Mint 13 host, and I noticed that powering off the machine (instead of shutting it down) took more than 42 minutes. I chose to power off the virtual machine because it had become totally unresponsive. The progress bar on the "powering off" notification is stuck at around 50%. What is the usual cause of this problem (if any is known)?

(I'll admit that I didn't look at any of the log files before posting this question - I'll try to add this information as soon as possible. The log files may contain relevant information, but I haven't yet found the relevant files.)

Recently, on September 1, 2013, I encountered a very similar problem on a Windows 8 host machine with a Linux Mint guest machine. Now it's stuck at 14% instead of 50%, and the estimated time remaining is more than 2 hours.

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@MichaelHampton I didn't select the "shut down" option in Virtualbox - I selected the "power off" option. I have never encountered an error like this before - I expected the "power off" option to be much faster than the "shut down" option. –  Anderson Green Nov 12 '12 at 4:41
    
@MichaelHampton Also, do you know where the log files are likely to be stored (in case of an unusual error like this one?) –  Anderson Green Nov 12 '12 at 4:43
    
Unless Linux Mint is completely different than any other distribution, it will store log files in /var/log directory. –  Michael Hampton Nov 12 '12 at 4:45
    
@MichaelHampton Also, is it possible to "watch the shutdown process" even when the virtual machine is unresponsive? I don't understand this part entirely. –  Anderson Green Nov 12 '12 at 4:46
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OK, I was mistaken... "Power off" is like pulling the virtual power cord. It should go away pretty much immediately, doing whatever damage to your virtual guest's filesystem that yanking the power cord would do to a physical machine. You definitely have a weird problem here. –  Michael Hampton Nov 12 '12 at 5:17
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1 Answer

The time taken to shutdown may be due to less ram available for the PC to work. Which means if u have windows 7 64 bit and in the virtual machine you use Ubuntu 64 bit then the windows requires 2GB ram and ubuntu requires 1GB and in your PC you have installed 2 GB ram then there is a chance of slow response of the virtual machine.

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Is the "power off" option likely to be faster than the "shut down" option? I used the "power off" option, not the "shut down" option. –  Anderson Green Nov 12 '12 at 4:42
    
Shut down option takes comparatively more time than the power off. I think so power off option must he used –  Siddharth Warrier Nov 12 '12 at 5:47
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@SiddharthWarrier - Why do you talk about Windows when the author is using a Linux host? Where do you get the memory values from, this information was supplied, you just pulling this out of thin air? –  Ramhound Dec 5 '12 at 12:25
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