Member Avatar for xerox_ex

I downloaded ubuntu-12.04.2-desktop-i386 iso.Then i burn it to a DVD.But i can't run it as a live cd on Windows 7.I changed the bootable device oreder of BIOS also.Why is that?
Thanks

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Brief diagnostic addendum for , expanding on points from and with practical checks to isolate the problem (media, firmware, or drive).

First, confirm the ISO itself and how it was written. On Windows 7 the built‑in hash tool shows the file checksum; compare that value to Ubuntu’s published checksum to rule out a corrupted download:

certutil -hashfile ubuntu-12.04.2-desktop-i386.iso MD5

If the hash matches, confirm the disc contains a bootable image (use “Burn disc image” or an image-write option rather than copying the .iso as a file). Re-burning at a lower speed or using a different blank disc brand sometimes fixes read errors.

Next, check firmware/boot-mode issues. Many systems offer UEFI and legacy (CSM) modes; a 32‑bit i386 image can fail to boot on some UEFI‑only machines. If the board uses UEFI, try the 64‑bit (amd64) desktop ISO or enable legacy/CSM mode in firmware. Secure Boot on UEFI systems can also block older installers — disabling Secure Boot temporarily is a common diagnostic step. Use the motherboard’s one‑time boot menu (F12/F9/Esc) to try the optical drive directly rather than relying on BIOS order. Note: document any firmware changes so Windows boot settings can be restored.

Finally, isolate hardware vs media: test the burned DVD on another PC and verify the optical drive can boot other known-good discs. If DVD boot still fails, create a USB live stick with Rufus, balenaEtcher, or UNetbootin and try booting from USB — a successful USB boot points to the DVD burn or optical drive as the culprit.

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Member Avatar for rubberman

How did you burn it? Did you burn the ISO to the disc as a file, or as the complete image? It must be written as a complete image, and then you need to verify the disc checksum (md5sum is most common) to the iso checksum to be sure it was written successfully.

Member Avatar for Webville312

When you burned it onto the CD, did you burn it as a bootable image??

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