tracking down "Could not download all repository indexes" error

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http://ubuntu.5.x6.nabble.com РDear all, I keep getting this cryptic "Could not download all repository indexes" error message and I'm not sure how to track it down. From the CLI, I get this: root@liv-HP-Compaq-dc7900:/home/liv# apt-get update Ign file: apt-build Release.gpg Get:1 file: apt-build Release [107 B] Ign file: apt-build/main TranslationIndex Err file: apt-build/main i386 Packages File not found Ign file: apt-build/main Translation-en_US Ign file: apt-build/main Translation-en Hit http://extras.ubuntu.com precise Release.gpg [..] W: Failed to fetch file:/var/cache/apt-build/repository/dists/apt-bui (HowTos)