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Thread: Precise Pangolin 12.04 will not boot after writing dvd to .iso

  1. #1
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    Mar 2006
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    Ubuntu 16.04 Xenial Xerus

    Precise Pangolin 12.04 will not boot after writing dvd to .iso

    Using the dd command to write two .iso-s to the /media folder, upon trying to use gksugo thunar (or even nautilus) to move the .iso-s to my desktop (home/Mark/Desktop) I could not. I re-booted (twice) but neither time would the OS come up. It hung both times. I re-booted out with Alt-SysRq R E I S U B K. Now I'm in Live-USB mode and need help getting the OS up and running. The OS usually shows the 12.04 splash screen, but now it's showing code of some sort, ending with a line about Timidity.
    Last edited by Mark_in_Hollywood; June 13th, 2013 at 05:21 PM. Reason: changed prefix to solved
    AMD Athlon II X4 620, 4gig ddr2-800, m/b MSI K9N6PGM2, 1T SATA, EVGA 9500GT, Canon MB2320 all-in-one, LG DVD-rom GSA-H55N

  2. #2
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    Oct 2009
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    New Hamsha
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    Kubuntu 13.04 Raring Ringtail

    Re: Precise Pangolin 12.04 will not boot after writing dvd to .iso

    The dd command isn't what you want to use for writing dvds (as you now see). It is a file copier, in a sense, but it doesn't copy files themselves, it copies raw data. So you have probably messed up your filesystem. I wonder what is the exact command you used.
    This is an interesting problem and data corruption is a tricky issue, you could try just making a new folder named "media" in Live USB mode, and then use the dd command to write this folder raw to its original location on the hard disk.
    But the only surefire way of fixing this now is to backup your data and reinstall.
    AMD A4-3400 w/ Radeon HD 6410D, 8 GB Corsair Vengeance DDR3 1333Mhz, Kubuntu 14.04, SliTaz 4.0, Windows 8.1, Ubuntu 14.04 VM
    " ... Love your neighbor as you love yourself."

  3. #3
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    Re: Precise Pangolin 12.04 will not boot after writing dvd to .iso

    Here is the terminal command

    dd if=/dev/cdrom of=image_name.iso

    so I did:

    sudo dd if=/dev/cdrom of=image_<source_code>.iso (Source Code is a theatrical movie). The first time I ran this, I forgot ".iso" at the end. So, dd balked and returned something now lost to my memory. I ran dd again and added the .iso filename extension. Again, dd balked returned some strange info.

    BUT, earlier today, before the dvd copying, while trying something or other that needed sudo, the OS 3 times returned incorrect password. The 3rd try cannot have been wrong and my keyboard does type those characters correctly.

    For what it's worth, I got the idea for using dd from here:

    http://askubuntu.com/questions/14780...iso-accurately
    AMD Athlon II X4 620, 4gig ddr2-800, m/b MSI K9N6PGM2, 1T SATA, EVGA 9500GT, Canon MB2320 all-in-one, LG DVD-rom GSA-H55N

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