Problem upgrading from 15.10 to 16.04

[Bob]

Upgrading from 15.10 to 16.04 there was an error, if there was a message I did
not see it because I let the upgrade run overnight .  The first boot after the
upgrade I got the message:

Sorry the application gacutil.exe has stopped unexpectedly

Searching it appears to be a windows program!  Now at every boot I get a popup
to report a problem but no indication what the error is.

What commands do I need to do to try a get the package database checked and to
get whatever failed the first time redone?

-- 
Robert Blair


The inherent vice of capitalism is the unequal sharing of the blessings.  The inherent blessing of socialism is the equal sharing of misery.  -- Winston Churchill