Bug#184074: readlink behavior different from debianutils version.
debianutils "readlink -f" allowed non-existing files to be
completed. But coreutils readlink does not have the same behavior.
pbuilder was affected, and I think other packages may be affected too.
readlink in debianutils used to have this documentation:
-f Using realpath(3), canonicalize by following every symlink in every
component of the given path recursively. Note that the resultant
pathname might not exist,
sid$ readlink -f random-name ; echo $?
woody$ readlink -f random-name ; echo $?