Ubuntu
ubiquity package

Booting from CD

Asked by abubakar kilgori

I tried booting ubuntu 11.04 from CD on my Acer 5610 laptop with installed windows 7 OS, it starts loading and showed this error message "Cannot mount: //dev/loop0 (/cdrom/casper/filesystem.squashfs) on /cdrom/casper/filesytem.squashfs" and also i tried installing wubi on my windows 7 OS it does not work either.

Please help.

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Benjamin Tan Chun Yung (benjamin-chiyawa) said : 		#1

Try download Ubuntu again. It might help.

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Eliah Kagan (degeneracypressure) said : 		#2

I agree with Benjamin Tan Chun Yung that this looks like it was due to a bad download. However, rather than immediately redownload Ubuntu, I recommend that you MD5 test the .iso image you downloaded. (See https://help.ubuntu.com/community/HowToMD5SUM.) If that doesn't check out, you'll have to redownload the .iso image, MD5 test the new image, and (assuming the new one checks out) burn a new disc or write it to the USB flash drive again.

If you have already redownloaded Ubuntu, you would still be well-advised to MD5 test the redownloaded .iso image file before using it.

After determining that your CD/DVD was burned, or your USB flash drive written, using a good .iso image, you should verify that the live CD/DVD/USB was written correctly and is readable by the machine on which you're installing.

To do that, boot from it, and immediately when you see the person and keyboard icons at the bottom center of the screen, press Spacebar, select your language, and select "Check disc for defects". (This goes for USB flash drives as well as CD's and DVD's.) If that doesn't check out, you'll have to burn a new disc or re-write the .iso image to the USB flash drive (and run this test on it again).

If both the MD5 test and checking the installation medium for defects check out but you still get this error, then you'll have to provide more information:

(1) Are you installing from a CD, a DVD, a USB flash drive, or using some other method altogether? (Please answer this question both for the regular installation you attempted, and for the Wubi installation you attempted.)

(2) How, specifically, did you burn the image to CD/DVD or write the image to the USB flash drive?

(3) In the Wubi installation, how does it fail?

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