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Recover the Linux root password

Resolution

  1. Boot server from the installation CD.
  2. Then select any installation method or Rescue System.
  3. At the first installation screen when selecting language, press ctrl-alt-f2 to open a virtual console.

    Note: If you selected Rescue System, select your keyboard language and then a Rescue Login prompt should appear. Login as root.

  4. Type
    fdisk -l
    to list the partitions. Locate the Linux root partition.
  5. Type
    mount /dev/sda4 /mnt
    (replace sda4 with the device name for the Linux root partition identified in the previous step).
  6. Run
    mount -o bind /dev /mnt/dev
    to make the device files available (this is needed for access to the urandom device which may be used by the passwd command below).
  7. Enter
    chroot /mnt
  8. Now enter
    passwd root
    and reset the root password.
  9. Type
    exit
    to leave the chroot environment.
  10. Reboot the system.

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