tracking down "Could not download all repository indexes" error

[Liviu Andronic]

Dear 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 at 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-build/main/binary-i386/Packages
File not found

E: Some index files failed to download. They have been ignored, or old
ones used instead.


How do I make aptitude stop reporting this error? I'm using Ubuntu
Precise on amd64.

Regards,
Liviu

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