Software Updater

[Geoffrey Combes]

I am using 14.04 LTS. The Software Updater is failing, reporting an 
error after 55% installatlion.
I can neither install updates nor install programs.
I thought of removing the application and re-installing it but Ubuntu's 
Software Centre warns against removal as one would expect.
Before taking his action I would appreciate any advice on how to correct 
this fault.
Geoffrey Combes