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The Unofficial Ubuntu Starter Guide
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Q: How to change GRUB menu password if forgotten?

  1. Read General Notes
  2. grub
    
    grub> md5crypt
    Password: ****** (ubuntu)
    Encrypted: $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password)
    grub> quit
    
    sudo cp /boot/grub/menu.lst /boot/grub/menu.lst_backup
    sudo gedit /boot/grub/menu.lst
  3. Find this line
    ...
    password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
    ...
  4. Replace with the following line
    password --md5 $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password above)
  5. Save the edited file (sample)
The Unofficial Ubuntu Starter Guide
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