shirish@Mugglewille:~$ apt-cache policy libgnomevfs2-0
libgnomevfs2-0:
  Installed: 1:2.21.91+svn20080131r5441+bbot-1
  Candidate: 1:2.21.91+svn20080131r5441+bbot-1
  Version table:
 *** 1:2.21.91+svn20080131r5441+bbot-1 0
        500 http://www.sofaraway.org gstreamer0.10/ Packages
        100 /var/lib/dpkg/status
     1:2.20.1-1ubuntu1 0
        500 http://archive.ubuntu.com hardy/main Packages

shirish@Mugglewille:~$ sudo aptitude install libgnomevfs2-0=1.2.20.1-ubuntu1
[sudo] password for shirish: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information       
Initializing package states... Done
Building tag database... Done      
Unable to find a version "1.2.20.1-ubuntu1" for the package "libgnomevfs2-0"
Unable to find a version "1.2.20.1-ubuntu1" for the package "libgnomevfs2-0"
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Writing extended state information... Done
Reading package lists... Done             
Building dependency tree       
Reading state information... Done
Reading extended state information       
Initializing package states... Done
Building tag database... Done