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i forgot my old one. can't access GRUB because the piece of Ubuntu i use is the terminal, i don't have any interface.

Kristopher Ives
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Heather Noe
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  • By default Ubuntu installs without a 'root' password; though one can be added post-install. If you install over it (& format) it will re-install & again have the default no root password. Depending on choices made, you could be asked your password (eg. no format, encrypted partitions etc) before it'll re-install without format, but you can overwrite your system clean (assuming the password is not a hdd/sdd or hardware-firmware-level password) – guiverc Feb 12 '19 at 02:53

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I may be mistaken but I don't think that there is a "Root" password. There is only the user password and whether or not the user can have access to "Root".

dewd
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    https://askubuntu.com/questions/189907/what-is-the-default-root-password – dewd Feb 12 '19 at 01:44
  • It's common for new users who have set automatic login, to forget the password associated with their user. They often refer to this as the "root" password.... – Charles Green Feb 12 '19 at 16:28
  • @CharlesGreen How true. I set up a server for my brother one time. With auto login on. He was trying to do something and said "I don't have a password". Not sure how he missed that file on his desktop with the filename in all caps "this is your password" . – dewd Feb 12 '19 at 17:04