Libre Office comes pre-installed on Mint. Software manger says not installed.

[Keith Smith]

Hi,

I'm running Mint 17 KDE and want to use Libre Office Base to create some 
entity relationship diagrams.  Mint came with Libre Office pre 
installed, however there is not Base.

I saw a suggestion to use the software manager to do the install.  I 
opened it and searched for Libre Office.  It said it is not installed.  
How could that be?  I use Libre Office all the time.  It is there.

Thank you in advance for your insight.

-- 
Keith Smith