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I was following the instructions of this tutorial HOWTO: Purge and Reinstall Grub 2 from the Live CD, 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?

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3 Answers 3

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

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It is but still cannot chroot –  Starx Mar 29 '12 at 10:03

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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I think in is a BUG.

`/bin/bash'

but not

'bin/bash'

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