Bug#2259: popclient: clearbiffbit: fchmod: Operation not permitted
It's saying it can't change the mode of a terminal device. "biff", a
primitive mail notification program named after Heidi Stettner's dog,
uses one of the unused mode bits of the device to tell whether it
should write messages to your terminal or not.
Bruce Perens <Bruce@Pixar.com> Pixar Animation Studios
Author of the Twelve-Step Program to Quit Emacs
Toy Story: > US$174M domestic box office receipts and an Oscar so far.