How to SOLVE system errors at startup, not just report them
I have the same problem, and I think its a bug on the Ubuntu error reporting system (which is called "apport"). Apport notifies the problem to Ubuntu developers, in view of having it solved by them in the next Ubuntu update or release.
Unfortunately seems that in the last Ubuntu releases, some error reports are not registered as submitted, so the system loops the task every time the computer starts up.
Go to the Terminal and type:
sudo rm /var/crash/*
That will manually delete all the old crashes in stored memory, and you'll stop receive these notifications. Until a new report will loop again though...