It seems that 10gen has changed the original configuration back, thanks Mr. Mike Stringer for noticing. So, source configuration
deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen
works at this moment. I will keep eye on the repository changes, follow me @vjom for further updates.
Mr. Robert Meerman has also reported the (original) issue to MongoDB's JIRA. Hope we'll get clarification soon which one to use... ;)
Tonight, I tried to upgrade to the latest MongoDB server version in my Ubuntu box, but apt-get update gave the following error:
W: Failed to fetch http://downloads-distro.mongodb.org/repo/ubuntu-upstart/dists/dist/Release Unable to find expected entry '10gen/binary-amd64/Packages' in Release file (Wrong sources.list entry or malformed file)It seems that 10gen has recently changed their Release file structure, but the Ubuntu installation documentation does not yet reflect their latest changes (as per 18th Oct 2013). The problem is easy to fix:
Find the file, where your current mongodb-10gen source configuration lies. Most likely it's /etc/apt/sources.list.d/mongodb-10gen.list
Change the following line
deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gento read
deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist mongodbFinally, run apt-get update again and you are good to go.