There is a discussion of this problem right on
Treviño's page, if you scroll down in the comments, starting with comment number 139.
Basically, the problem files are kubuntu-default-settings and possibly kubuntu-artwork-usplash. If you revert these back to version 1:6.10-61 the ominous messages should disappear.
However, it troubles me (as it apparently does some commenters) that someone would do something like this in an attempt to keep Ubuntu users in a "walled garden." This "helpful warning" could be seen by some as an attempt to start a Ubuntu "cult", where you're not allowed to seek out any information or software from outside the "cult" without fear of repercussion from within.
Whoever came up with these bogus packages needs several good swift kicks in the posterior, IMHO!
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