I was trying to use the following command to install build-dep on Ubuntu 10.10: apt-get build-dep --no-install-recommends linux-image-$(uname -r) but I got the following error: E: You must put some 'source' URIs in your sources.list I have already changed archive.ubuntu.com to old-releases.ubuntu.com for all the repositories in my source list. After including the source repositories, I got a different error: E: Could not open file /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_precise_main_source_Sources - open (2: No such file or directory) Any suggested solutions? Thanks!