Ubuntu 14.10 also affected.
$ LANG="C" sudo apt-get -s dselect-update E: Command line option 's' [from -s] is not known.
apt version: 1.0.9.2ubuntu2
Ubuntu 14.10 also affected.
$ LANG="C" sudo apt-get -s dselect-update
E: Command line option 's' [from -s] is not known.
apt version: 1.0.9.2ubuntu2