How do I limit the updates that are installed to those from a specific set of repositories? Is this at all possible?
You can disable automatic updates from certain repositories without entirely removing them via
To disable automatic updates from repository
Which will give all packages from this repository a lower priority than already installed packages (which have 100).
For more information
You can specify a repository with
As you know there is a same package
from apt-get manual page:
I think this is a better solution,
A gui based alternative would be to open software centre and select edit > software sources...
all you need to do is un-tick the repositories you don't want updates from.
Hope this helps
Obvious choice is to modify
And then remove comments from
On related note, for example Ubuntu distribution upgrade process disables all 3rd party repositories during upgrade (and do not just run some option to exclude those temporarily).