Ubuntu: I got this error: "chroot: failed to run command '/bin/bash': Exec format error"

Ubuntu: During a chroot attempt, I got this error: "chroot: failed to run command '/bin/bash': Exec format error"


The Question: I was following the instructions of this tutorial http://ubuntuforums.org/
showthread.php?t=1581099, when I encountered an error at step 1, as I launched
the command
sudo chroot /mnt/temp
The error was the following:
chroot: failed to run command `/bin/bash': Exec format error
Where does that come from? How do I get through?

Solutions Sample (Please watch the whole video to see all solutions, in order of how many people found them helpful):

== This solution helped 21 people ==
Verify that you are using the right Live CD. For example, verify you are not
using a 32bit CD instead of a 64bit CD. You need a 64bit kernel to run 64bit
code, so check your architecture.
Assuming you mounted your system to be chrooted in /media/sda1, to determine
the architecture you can:
ls /media/sda1/*
if you see lib64 in the output, it's probably a 64bit system

== This solution helped 1 person ==
The error means that your jail (/mnt/temp) does not contain a bash shell, or
does not contain the libraries required to run the bash shell.
If you created your jail using something like this:
debootstrap --variant=buildd --arch i386 lucid /mnt/temp http://
archive.ubuntu.com/ubuntu/
You probably meant to do this instead:
debootstrap --variant=minbase --arch i386 lucid /mnt/temp http://
archive.ubuntu.com/ubuntu/
However, as a technical answer to your problem, try:
cp -r /bin /lib /mnt/temp
This should allow you to chroot successfully, at which point you can do other
things.
There are about a million things wrong with doing that though, and almost
certainly you do not want to do that. Use minbase when you create your jail, or
install ubuntu on a blank target (eg. a virtual machine) and create a tar
archive of the entire system which you then decompress into /mnt/temp.

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