Synaptic pkg error when attempting upgrade from 2.70 to 2.7.8

I'm running the Deb Wheezy 2.7 ISO - installed no problem. Running (as far as Ive taken it so far) no problem. But when I try to update to 2.7.8 Synaptic throws:

"Failed to fetch linuxcnc.org/dists/wheezy/Release Unable to find expected entry '2.7.8-rtai/source/Sources' in Release file (Wrong sources.list entry or malformed file)
Some index files failed to download. They have been ignored, or old ones used instead."

Indeed when I look there I do not see 2.7.8 - only 2.7. I'm sure I'm missing something basic; could someone give me a pointer in the right direction?

Have you tried to reset your internet connection? Or tired more than once?

If you are just trying to upgrade you could just download the .deb from here [looking for the latest release]
linuxcnc.org/dists/wheezy/2.7-rtai/binary-i386/ [32bit]

That should get you going short term. Look in synaptic package manager, under sources see what is listed for your sources. You might need to add the source if not there already [or listed incorrectly/possibly with white space?]

The instructions are here. buildbot.linuxcnc.org/

Ha!

Good catch, did not think about the possibility that he hadn't updated sources listing since the install.

Here is a way via terminal/console:
then you can typeTo update all available packages listed in synaptic.

manpages.ubuntu.com/manpages/zesty/en/man8/apt-get.8.html

Thanks for the suggestions, but no joy. Yes, my internet connection is good and I have tried multiple times. I have been trying to update the package list and I believe this is where the problem is. with synaptic during the attempted package update I get the error above. With the suggested command line update I get:
"W: Failed to fetch linuxcnc.org/dists/wheezy/Release Unable to find expected entry '2.7.8-rtai/source/Sources' in Release file (Wrong sources.list entry or malformed file)"

When I look in ../wheezy/Release I see lots of 2.7 packages but nothing labeled 2.7.8.

Is 2.7.8 within the 2.7 package? If so, what is the source of the list that apt and synaptic are using directing it to 2.7.8-rtai...

Sorry, I come at this from primarily a Unix background with little direct experience with Debian (yet

No, I did not edit the the sources list. Not even sure where it lives exactly yet - just wanted to check since both synaptic and command line are complaining that the 2.7.8-rtai... is not found.

no gdebi. Think I'll try to track that down. I think I used apt -R when I was installing vnc but gdebi sounds like it'll save some time in the future.