That would make sense if
http://downloads.mongodb.org/ didn't return a "403 Forbidden" error every time any page is accessed. This happened too with apt-get update:
Code:
kenny-strawn@kennystrawn-laptop:~$ sudo apt-get update
Ign http://downloads.mongodb.org 10.04 Release.gpg
Ign http://downloads.mongodb.org/distros/ubuntu/ 10.04/10gen Translation-en
Ign http://downloads.mongodb.org/distros/ubuntu/ 10.04/10gen Translation-en_US
Ign http://downloads.mongodb.org 10.04 Release
Hit http://security.ubuntu.com maverick-security Release.gpg
Ign http://security.ubuntu.com/ubuntu/ maverick-security/main Translation-en
Ign http://downloads.mongodb.org 10.04/10gen i386 Packages
Get:1 http://us.archive.ubuntu.com maverick Release.gpg [198B]
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/main Translation-en
Hit http://archive.canonical.com maverick Release.gpg
Ign http://archive.canonical.com/ubuntu/ maverick/partner Translation-en
Ign http://downloads.mongodb.org 10.04/10gen i386 Packages
Err http://downloads.mongodb.org 10.04/10gen i386 Packages
403 Forbidden
Ign http://security.ubuntu.com/ubuntu/ maverick-security/main Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/universe Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/universe Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/main Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick-updates Release.gpg
Hit http://security.ubuntu.com maverick-security Release
Ign http://archive.canonical.com/ubuntu/ maverick/partner Translation-en_US
Hit http://archive.canonical.com maverick Release
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en
Hit http://security.ubuntu.com maverick-security/main Sources
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick-backports Release.gpg
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/main Translation-en
Hit http://archive.canonical.com maverick/partner Sources
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/main Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/multiverse Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/restricted Translation-en_US
Hit http://security.ubuntu.com maverick-security/restricted Sources
Hit http://security.ubuntu.com maverick-security/universe Sources
Hit http://security.ubuntu.com maverick-security/multiverse Sources
Hit http://security.ubuntu.com maverick-security/main i386 Packages
Hit http://security.ubuntu.com maverick-security/restricted i386 Packages
Hit http://archive.canonical.com maverick/partner i386 Packages
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick-proposed Release.gpg
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/main Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/main Translation-en_US
Hit http://security.ubuntu.com maverick-security/universe i386 Packages
Hit http://security.ubuntu.com maverick-security/multiverse i386 Packages
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/multiverse Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-proposed/universe Translation-en_US
Get:2 http://us.archive.ubuntu.com maverick Release [57.3kB]
Hit http://us.archive.ubuntu.com maverick-updates Release
Hit http://us.archive.ubuntu.com maverick-backports Release
Hit http://us.archive.ubuntu.com maverick-proposed Release
Get:3 http://us.archive.ubuntu.com maverick/main Sources [834kB]
Get:4 http://us.archive.ubuntu.com maverick/restricted Sources [4,385B]
Get:5 http://us.archive.ubuntu.com maverick/universe Sources [4,177kB]
Get:6 http://us.archive.ubuntu.com maverick/multiverse Sources [151kB]
Get:7 http://us.archive.ubuntu.com maverick/main i386 Packages [1,506kB]
Get:8 http://us.archive.ubuntu.com maverick/restricted i386 Packages [6,217B]
Get:9 http://us.archive.ubuntu.com maverick/universe i386 Packages [5,778kB]
Get:10 http://us.archive.ubuntu.com maverick/multiverse i386 Packages [183kB]
Hit http://us.archive.ubuntu.com maverick-updates/main Sources
Hit http://us.archive.ubuntu.com maverick-updates/restricted Sources
Hit http://us.archive.ubuntu.com maverick-updates/universe Sources
Hit http://us.archive.ubuntu.com maverick-updates/multiverse Sources
Hit http://us.archive.ubuntu.com maverick-updates/main i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/universe i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/multiverse i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/main i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/universe i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/multiverse i386 Packages
Hit http://us.archive.ubuntu.com maverick-proposed/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick-proposed/main i386 Packages
Hit http://us.archive.ubuntu.com maverick-proposed/multiverse i386 Packages
Hit http://us.archive.ubuntu.com maverick-proposed/universe i386 Packages
Fetched 12.7MB in 1min 26s (147kB/s)
W: Failed to fetch http://downloads.mongodb.org/distros/ubuntu/dists/10.04/10gen/binary-i386/Packages.gz 403 Forbidden
E: Some index files failed to download, they have been ignored, or old ones used instead.