[Bug 773295] Re: Sudo asks for root password instead of user password

[Adam Reichold]

Exactly the same problem here, after using the alternate CD to install
Ubuntu 11.04 with the command line only and installing the package
lubuntu-desktop afterwards on a memory constrained system, gksu uses the
su instead of sudo authentication method by default.

But I was able to solve the problem by running gksu-properties using the
user account and not using the root account. So instead of running "gksu
gksu-properties" try running "gksu-properties" and change the
authentication method. Worked for me.

(IMHO, this has nothing to do with PolicyKit as applications like
Synaptic currently lack integration with it. That is the reason they
have to use gksu even though PolicyKit is preferred in the first place.)

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https://bugs.launchpad.net/bugs/773295

Title:
  Sudo asks for root password instead of user password

Status in “sudo” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: sudo

  On a fresh install of Natty sudo asks for the (nonexistent) root
  password instead of the user's password.  I Googled thoroughly for
  this issue and found that this can happen if /apps/gksu/sudo-mode is
  not checked.  I opened gconf-editor and checked this key and it was
  checked.  I unchecked and checked it and it still didn't resolve the
  issue.

  Steps Taken:
  Open something that requires root through Gnome.  I opened "Additional Drivers".
  Do something that requires root in the program.  I tried activating the proprietary NVidia drivers.

  Expected Behavior:
  gksu/gksudo asks for your password, program continues in super-user mode

  Observed Behavior:
  gksu/gksudo asks for the root password, fails because there is no root password set

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