Error: We couldn’t complete the updates, Undoing changes. Don’t turn off your computer.

Ron - there's no magic fix coming that I can see.  They already released an update to this KB2919355, I don't see another version coming.

Waiting won't fix this problem.

Then I'll be without updates until I move to another OS.  I'm not wasting hours on re-installing this same OS, with the chance, or even likelihood that MS will just screw up my system again down the road.

I posted to this thread towards the beginning, mostly as a "me too," as I was having much the same problem with this update as everyone else...  It would install completely but then fail upon reboot and eventually undo all changes.   There was no error code and the install history showed that the update was installed even after the "undo all changes." 

On page 5?  We found out that if there was a space problem somehow it wasn't likely to be associated with a partition.   I suggested you try to get more information about your failure, e.g. with a trace.  But even just looking in the logs would probably have found something.  The problem is that these failures are mostly of a class of error known as "This will never happen."  so of course there is no simple external symptom for the user to report (especially since the recovery action for them is to try to undo things and pretend that they didn't happen) and the only way to get more details about them is to dig into the diagnostics in whatever way you can.

Robert your post is most interesting. You ask the user/customer to get more information, ask them to do a trace, and then ask them to look in the logs and lastly to "to dig into the diagnostics in whatever way you can". 

As a computer geek for the past 30 years I fully understand what you are saying but how do you think this comes across to the vast majority of users/customers? Do you truly think the average user is capable of these requests? I could deal with this, but my elderly mother would be totally confused about what you are saying. 

For example, your post "We found out that if there was a space problem somehow it wasn't likely to be associated with a partition.   I suggested you try to get more information about your failure, e.g. with a trace" is Greek to 95% or more of computer users/customers. 

Rather than these types of posts why don't you and everyone else who has any affilation with Microsoft, whether as a "MVP", "Support Engineer" or otherwise, prevail on the company to solve this problem. Ok, you say are a volunteer and are not officially affiliated with the company, but at the same time what do you think the average poster thinks when they see a post from someone who is a "MVP", "Support Engineer, etc.? Who supplies these "titles"? If you choose to use these titles which indicate some "official relationship" to the company and expertise, then either assist them in resolving the issue based on their level of expertise, or refer them to someone with the company who can assist them in resolving their issue(s). 

I'm sorry to come across so harshly, but after two months of this and similar posts it is becoming rather old. You and other similar posters are taking the users into the tall weeds for which there is no resolution.

Don't apologize for your opinion.  You are spot on.  I can only apologize that I/we only have so much we can do and obviously it's not nearly enough.