make sure you install "snmp-mibs-downloader" in debian.
apt-get install snmp-mibs-downloader
you my also need to edit your /etc/apt/sources.list
deb http://ftp.us.debian.org/debian/ wheezy main contrib non-free
deb-src http://ftp.us.debian.org/debian/ wheezy main contrib non-free