After full-upgrade, `Meta' key not working within Emacs

[Rodolfo Medina <rodolfo.medina@gmail.com>]

My sources.list:

# Unstable
deb http://ftp.uk.debian.org/debian/ unstable main
deb-src http://ftp.uk.debian.org/debian/ unstable main

deb http://ftp.debian.org/debian/ unstable main contrib non-free

.  After last full-upgrade, Emacs starts without X support and with the `Meta'
key not being recognized.  How to fix that?

Thanks for any help,

Rodolfo