apt-get build-dep gwibber fails

$ sudo apt-get build-dep gwibber
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Could not open file /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_karmic_main_source_Sources - open (2 No such file or directory)

ProblemType: Bug
Architecture: amd64
Date: Tue May 26 00:24:58 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: gwibber (not installed)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.30-5.6-generic
SourcePackage: gwibber
Uname: Linux 2.6.30-5-generic x86_64
UnreportableReason: This is not a genuine Ubuntu package

$ apt-cache policy gwibber
gwibber:
  Installed: (none)
  Candidate: 1.2.0~bzr309-0ubuntu1~daily1
  Version table:
     1.2.0~bzr309-0ubuntu1~daily1 0
        500 http://ppa.launchpad.net karmic/main Packages
     0.9.2~bzr263-0ubuntu1 0
        500 http://darkstar.ist.utl.pt karmic/universe Packages