Comment 8 for bug 115087

I'm also having problems with this. Tried all of the above but I keep getting this error:

Reading package lists... Error!
W: Duplicate sources.list entry http://us.archive.ubuntu.com dapper/universe Packages (/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_dapper_universe_binary-i386_Packages)
E: Dynamic MMap ran out of room
E: Error occurred while processing qt3-linguist (NewVersion1)
E: Problem with MergeList /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_dapper-security_universe_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.

That's after running this:
steve@Bigrock:~$ sudo do-release-upgrade --devel-release
Checking for a new ubuntu release
Done Upgrade tool signature
Done Upgrade tool
Done downloading
extracting '/tmp/tmpnS8BeD/gutsy.tar.gz'
authenticate '/tmp/tmpnS8BeD/gutsy.tar.gz' against '/tmp/tmpnS8BeD/gutsy.tar.gz. gpg'

Reading cache

Checking package manager
cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016) gutsy/main Packages cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016) gutsy/restricted Pa cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Pa Reading package lists: Donedapper-security/universe Packages: 75

Preparing the upgrade failed
Preparing the system for the upgrade failed. Please report this as a bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bugreport.