Cannot install updates from app store

Question

imac 2012, 2.7GHz i5, 8GB, Yosemite 10.10.2
After updating to Yosemite 10.10.1 the app store stopped installing system apps such as 10.10.2, iTunes, Hp and Epson updates, iMovies etc. I solved the 10.10.2 update by downloading and directly installing but the app store still did not not allow updates for security updates, iTunes etc.
App store lists the updates available, I click update, it says installing for 2 seconds, then says installed and lists the installed app under 'updates installed in the last 30days'. A few seconds later the app returns under 'updates available' as needing updating.
After trying verify and fix disk and verify and fix permissions without success, I reinstalled Yosemite 10.10.2 by using CMD R and selecting reinstall OS X, however the problem is exactly the same - I cannot update OS X software apps.
Any ideas?

Answer 1

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Click the Clear Display icon in the toolbar. Then try to update. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
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