The problem seems to be more serious and far reaching! That is, I am now
unable to execute sudo su from the terminal; i.e., the following occurs:

vir...@virgil-desktop:~$ sudo su
sudo: must be setuid root

and being a newbie to Ubuntu, I do not know how to handle this from
here.

Also, I am unable to execute the following:

   Administration -> Software Sources
   Administration -> Synaptic Program Manager

That is, when I try these, a "busy icon" is shown for a few seconds and
then disappears , and the programs are not executed.

The source of the problem may have been an attempted update of 5
packages this morning. When I turned on my computer, a few seconds after
my desktop appeared, I got a popup (Software updates are available for
this computer):

 Important security updates
    gnome-screensaver
    libmysqlclient16
    mysql-common
Recommended updates
   python-ubuntuone-client
   python-ubuntuone-storageprotocol

Of course, I tried to install them; but, this hung up the update manager
--- I had to close it after several minutes.

-- 
Unable to install from "Software Center"
https://bugs.launchpad.net/bugs/520349
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