I just installed Ubuntu 12.04 LTS and I am not able to find Adobe reader or Gnu plot in the software centre. When I try to get all updates, the process goes through till about 95% and then doesn't proceed. Hence, I had to stop it there.
Can someone please help me to install these software's.
And also let me know why I am unable to view these on the software center screen.

sudo apt-get updatein the terminal, and tell us weather it has any errors? – Seth Dec 4 '12 at 5:52