Unable to mount /dev/loop0 during install

I was installing 32-bit Ubuntu(ubuntu-10.10-desktop-i386.iso) on VMWare workstation 7.1. During installation an error came up with the following text.

(initramfs) mount: mounting dev/loop0 on //filesystem.squashfs failed: Input/Output error Can not mount /dev/loop0 (/cdrom/casper/filesystem.squashfs) on //filesystem.squashfs

I did a memory test which was successful, but when selecting "Try Ubuntu without installing", "Install Ubuntu" or "Check disk for defects" the same error is showing up.

I download the ISO image from Ubuntu website "". As I couldn't find the checksum data, the ISO image was verified by mounting to a virtual drive and browsing the contents.

The ISO image is mounted to a virtual drive in VMWare and not burnt to a CD.

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4 Answers

The checksums (MD5) can be found on releases.ubuntu.com. I would suggest you do the following:

1. Check that the MD5 checksum of the ISO image you downloaded matches the one in the aforementioned link, by following these directions.
2. If that looks okay, boot the CD and press the Spacebar key when you see the keyboard icon in the bottom-center of the screen. Select your language, then the "Check CD for defects" boot option.

If neither of those produce any errors, please file a bug here, following these instructions to attach /casper.log to it.

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Did you check the download prior to burning?

You can use a program such as winMD5Sum in Windows to check md5sums

The hashes you need to check against the downloaded iso can be found here

If you downloaded with a torrent then it should be checked as it downloads though.

If the hash check is ok then reboot with the cd and check it's integrity.

Press any key as the cd loads to see the cd menu

There are two common culprits of this error:

1. The CD or disk you burnt to did not have enough space for the entire .iso.
2. The .iso you downloaded had a problem when downloading.

Make sure you at least do these simple checks when going to install:

1. Check that the size of the downloaded .iso isn't ridiculous (Ubuntu 10.x and 11.04 are each approximately 680 MB, if yours is only like 400 MB, you obviously have a problem).
2. Check the amount of free space on your CD or disk before you burn to it (and remember, DVDs have lots more space than a generic CD).

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If you are sure about downloaded ISO as @Evan said, try another way to make your USB bootable, for example, if you are using UUI, it is better to use Rufus. However, if your problem did not solve, when the "install, try ubuntu live, etc" page appeared press "e" for editing and add acpi=off, it worked for me!

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