Unable to start the settings manager 'gnome-settings-daemon': Solution

Problem description

After logged in or went to " System -> Preferences -> Appearance", you saw the system give the following error message:

Unable to start the settings manager 'gnome-settings-daemon'.
Without the GNOME settings manager running, some preferences may not take effect. This could indicate a problem with Bonobo, or a non-GNOME (e.g. KDE) settings manager may already be active and conflicting with the GNOME settings manager.

There are several solutions that worked for several guys, such as:

1. Changing session files

Change /etc/X11/Xsession.d/55gnome-session_gnomerc, adding two lines (identified below by comments):

# Add the following line
rm -f /tmp/session-is-gnome

BASESTARTUP=`basename "$STARTUP" | cut -d\  -f1`
if [ "$BASESTARTUP" = gnome-session -o \
        \( "$BASESTARTUP" = x-session-manager -a \
        "`readlink /etc/alternatives/x-session-manager`" = \
                /usr/bin/gnome-session \) ]; then
  GNOMERC=$HOME/.gnomerc
  if [ -r "$GNOMERC" ]; then
    . "$GNOMERC"
  fi
  # Add the following line
  touch /tmp/session-is-gnome
fi

Then replace /etc/X11/Xsession.d/99x11-common_start file contents with the following text:

if [ -f /tmp/session-is-gnome ]; then
  exec /usr/bin/dbus-launch $STARTUP
else
  exec $STARTUP
fi

2. At the log in screen, go to Option -> Select session.

Select gnome (2.) and make it your default.

3. Of course, reinstall the OS.

But, none of them worked for me (did not try method 3, :-( ).

The method that worked for me is:

Solution

Edit /etc/network/interfaces, make sure the first two lines are:

 auto lo
 iface lo inet loopback 

Reboot.

If this solution won't work for you, welcome to leave a message/solution here.