crusoe@crusoe-desktop:~$ gksudo gedit /etc/apt/sources.list
(gedit:7868): GnomeUI-WARNING **: While connecting to session manager:
Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed.
crusoe@crusoe-desktop:~$ gksudo sh -c "gedit /etc/apt/sources.list; aptitude update; aptitude dist-upgrade"
gksudo: invalid option -- c
GKsu version 1.3.7

Usage: gksudo [-u <user>] [-k] [-l] <command>

  --always-ask-password, -a
    Do not try to check if a password is really
    needed for running the command, or if there
    are other means of obtaining it: simply ask for it.
  --debug, -d
    Print information on the screen that might be
    useful for diagnosing and/or solving problems.
  --disable-grab, -g
    Disable the "locking" of the keyboard, mouse,
    and focus done by the program when asking for
    password.
  --icon <icon>, -i <icon>
    Replace the default window icon with the argument.
  --message <message>, -m <message>
    Replace the standard message shown to ask for
    password for the argument passed to the option.
  --print-pass, -p
    Ask gksu to print the password to stdout, just
    like ssh-askpass. Useful to use in scripts with
    programs that accept receiving the password on
    stdin.
  --prompt, -P
    Ask the user if they want to have their keyboard
    and mouse grabbed before doing so.
  --ssh-fwd, -s
    Strip the host part of the $DISPLAY variable, so that
    GKSu will work on SSH X11 Forwarding.
  --sudo-mode, -S
    Make GKSu use sudo instead of su, as if it had been
    run as "gksudo".
  --title <title>, -t <title>
    Replace the default title with the argument.
  --user <user>, -u <user>
    Call <command> as the specified user.
  --desktop <file>, -D <file>
    Use a .desktop file to get the name of the application
    and the icon from.

  --preserve-env, -k
    Preserve the current environments, does not set $HOME
    nor $PATH, for example.
  --login, -l
    Make this a login shell. Beware this may cause
    problems with the Xauthority magic. Run xhost
    to allow the target user to open windows on your
    display!