dbserver:/usr/local/src# apt-cache search drbd
drbd0.7-module-source - RAID 1 over tcp/ip for Linux module source
drbd0.7-utils - RAID 1 over tcp/ip for Linux utilities
drbdlinks - Manages symlinks into a shared DRBD partition

dbserver:/usr/local/src# apt-cache show drbd0.7-module-source
Package: drbd0.7-module-source
Priority: extra
Section: admin
Installed-Size: 152
Maintainer: Cyril Bouthors <cyril@bouthors.org>
Architecture: all
Source: drbd0.7
Version: 0.7.21-4
Replaces: drbd-module-source, drbd-source
Provides: drbd-module-source
Depends: module-assistant, debhelper (>= 4), dpatch
Recommends: dpkg-dev, kernel-package, debconf-utils
Conflicts: drbd-module-source, drbd-source
Filename: pool/main/d/drbd0.7/drbd0.7-module-source_0.7.21-4_all.deb
Size: 142676
MD5sum: 1b2ce42d602f1f0a9df8bfef526450ff
SHA1: 873603b6f69a6441c6617e7f75efddc333e3ffaf
SHA256: cfc74a18c4eb4fe6b90186c809745131cf2fa4032c2c217cec0548d3e4b7c4ce
Description: RAID 1 over tcp/ip for Linux module source
 Drbd is a block device which is designed to build high availability
 clusters by providing a virtual shared device which keeps disks in
 nodes synchronised using TCP/IP. This simulates RAID 1 but avoiding
 the use of uncommon hardware (shared SCSI buses or Fibre Channel).
 It is currently limited to fail-over HA clusters.
 .
 This package contains the source code for the drbd kernel module.
 .
 Homepage: http://www.drbd.org
Tag: admin::cluster, admin::kernel, implemented-in::c, interface::commandline, network::hiavailability, role::source

dbserver:/usr/local/src# apt-get build-dep drbd0.7-module-source
Reading package lists... Done
Building dependency tree... Done
E: Unable to find a source package for drbd0.7

dbserver:/usr/local/src#