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Thread: Cannot Change Root Password In Recovery Mode

  1. #1
    Join Date
    Aug 2010
    Beans
    19

    Cannot Change Root Password In Recovery Mode

    I've just upgraded from 11.04 to 11.10 and luckily I'm still able to login via ssh keys. However, my root password no longer works to gain control of the machine.

    I rebooted the machine, went into recovery mode, then chose "remount" to mount the filesystems. Finally I choose "root: Drop to root shell prompt" but it asks me for root password or CTRL D to continue. Thus I cannot get into the the shell to do a passwd change.

    How can I bypass it from asking me for my root passwd in recovery mode?

  2. #2
    Join Date
    Dec 2009
    Location
    Fareham, UK
    Beans
    1,842
    Distro
    Ubuntu

    Re: Cannot Change Root Password In Recovery Mode

    Hi reset your password using this guide.

    http://www.psychocats.net/ubuntu/resetpassword

  3. #3
    Join Date
    Aug 2010
    Beans
    19

    Re: Cannot Change Root Password In Recovery Mode

    Quote Originally Posted by westie457 View Post
    Hi reset your password using this guide.

    http://www.psychocats.net/ubuntu/resetpassword

    Yeah I followed that guide step by step but when I pick the "drop to root shell prompt," it'll ask me for a root password to do maintenance or CTL D to continue. Any advice how to bypass this so I can get into the root shell?

  4. #4
    Join Date
    Nov 2011
    Location
    /dev/root
    Beans
    Hidden!

    Re: Cannot Change Root Password In Recovery Mode

    Quote Originally Posted by revzalot View Post
    I've just upgraded from 11.04 to 11.10 and luckily I'm still able to login via ssh keys. However, my root password no longer works to gain control of the machine.

    I rebooted the machine, went into recovery mode, then chose "remount" to mount the filesystems. Finally I choose "root: Drop to root shell prompt" but it asks me for root password or CTRL D to continue. Thus I cannot get into the the shell to do a passwd change.

    How can I bypass it from asking me for my root passwd in recovery mode?
    The security philosophy of Ubuntu excludes logging in as root. It is possible that your tweak to do so was lost with the upgrade to a new version.

    Are you able to log in with your normal user account? In that case I suggest that you try using sudo to obtain root privileges. The advantage of sudo is that you get only temporary root privileges. This reduces the risk to destroy the system or delete important user data.

    If you have problems to log in at all or to use sudo, I was going to suggest the following link.

    http://www.psychocats.net/ubuntu/resetpassword

    But I'm late and now I know that you already tried that.

    Is your home directory encrypted?

  5. #5
    Join Date
    Aug 2010
    Beans
    19

    Re: Cannot Change Root Password In Recovery Mode

    Quote Originally Posted by sudodus View Post
    The security philosophy of Ubuntu excludes logging in as root. It is possible that your tweak to do so was lost with the upgrade to a new version.

    Are you able to log in with your normal user account? In that case I suggest that you try using sudo to obtain root privileges. The advantage of sudo is that you get only temporary root privileges. This reduces the risk to destroy the system or delete important user data.

    If you have problems to log in at all or to use sudo, I was going to suggest the following link.

    http://www.psychocats.net/ubuntu/resetpassword

    But I'm late and now I know that you already tried that.

    Is your home directory encrypted?
    After the upgrade, I cannot login normally with login and password thus I cannot sudo as well. Yes I was able to sudo before I upgraded. Now I really need to change my password in the recovery console but I cannot since it keeps asking for root password or CTL D to continue. Luckily, I login via ssh keys and I tried to change my passwd when I logged in but no go. I tried those steps in the links many times. I've also tried using the UBuntu Live CD and I could not chroot into my mounted filesystems. I'm running out of ideas trying to change my password. Please help anyone.

    PS. My home directory is not encrypted but it's using LVM.

  6. #6
    Join Date
    Aug 2010
    Beans
    19

    Re: Cannot Change Root Password In Recovery Mode

    SOLVED!
    Here's how I did it.

    1. Use an Ubuntu Live CD and Load it.
    2. Click on try Ubuntu to get into Live CD Desktop.
    3. Open a terminal
    4. Since I'm having trouble mounting my LVM filesystem:
    apt-get install lvm2
    5. pvscan # scan the physical volumes
    6. vgscan # find the volume groups
    7. vgchange -a y # activate volume groups all
    8. lvscan # make sure their all activated
    9. mount /dev/VolGroup00/LogVol00 /mnt # mount the lvm filesystem
    10. passwd root # change new password for root
    11. reboot

    Voila! I'm now able to log in.

    On my next upgrade, I'm going to update a password after all the upgrades and right before rebooting to avoid this mess. )

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