/etc/fstab:

//192.168.2.20/Movies /mnt/Movies cifs rw,noexec,nosuid,password=Password1,username=buffalonas,nodev

crash@crash-M17x:/sbin$ sudo mount -a

mount: wrong fs type, bad option, bad superblock on //192.168.2.20/Movies,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

crash@crash-M17x:/sbin$ sudo apt-get install cifs-utils

Reading package lists... Done
Building dependency tree
Reading state information... Done
cifs-utils is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

apt-cache policy cifs-utils

apt-file list cifs-utils

cifs-utils: /etc/request-key.d/cifs.idmap.conf
cifs-utils: /etc/request-key.d/cifs.spnego.conf
cifs-utils: /sbin/mount.cifs
cifs-utils: /usr/bin/cifscreds
cifs-utils: /usr/bin/getcifsacl
cifs-utils: /usr/bin/setcifsacl
cifs-utils: /usr/sbin/cifs.idmap
cifs-utils: /usr/sbin/cifs.upcall
cifs-utils: /usr/share/doc/cifs-utils/NEWS.Debian.gz
cifs-utils: /usr/share/doc/cifs-utils/README
cifs-utils: /usr/share/doc/cifs-utils/changelog.Debian.gz
cifs-utils: /usr/share/doc/cifs-utils/copyright
cifs-utils: /usr/share/man/man1/cifscreds.1.gz
cifs-utils: /usr/share/man/man1/getcifsacl.1.gz
cifs-utils: /usr/share/man/man1/setcifsacl.1.gz
cifs-utils: /usr/share/man/man8/cifs.idmap.8.gz
cifs-utils: /usr/share/man/man8/cifs.upcall.8.gz
cifs-utils: /usr/share/man/man8/mount.cifs.8.gz

dlocate -md5check cifs-utils