Comment 2 for bug 378844

First, resolvconf should not fail and block an update. Fix would be to check if /etc/resolv.conf is writable in package control scripts.

Second, I think a debconf notice should be used to tell users who have immutable resolv.conf that they probably don't want resolvconf installed. I know that debconf notices should be used sparsely, but I guess this would be a proper case: almost all users won't see it, and the other ones would be happy to know that they can safely remove this package.