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Upgrade from 10.04 LTS Lucid to 12.04.2 LTS though software manager fails.

I go to, "System" -> "Administration" -> "Update Manager" to update. The process starts up and I get one dialog interruption:

Third party sources disabled

Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager.

I click "continue."

Then when the Update Manager gets to, "Setting New Software Channels" the following error occurs.

Error during update

A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.

W:GPG error: h++p://deb.opera.com stable InRelease: Unknown error executing gpgv,

W:Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/main/source/Sources 404 Not Found [IP: 91.189.91.14 80],

W:Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/restricted/source/Sources 404 Not Found [IP: 91.189.91.14 80],

W:Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/universe/source/Sources 404 Not Found [IP: 91.189.91.14 80],

W:Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/multiverse/source/Sources 404 Not Found [IP: 91.189.91.14 80],

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

Please note: I am using "h++p" instead of "http" in this post because of the restriction on posting links for new users (low reputation).

Despite the suggestion regarding network connectivity being the issue, I do have network access/connection.

Another related symptom may be, when I try and check for software updates I get the following error:

Could not download all repository indexes

The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct

GPG error: h++p://deb.opera.com stable Release: The following signatures were invalid: BADSIG E585066A30C18A2B Opera Software Archive Automatic Signing Key 2013 Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/main/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/restricted/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/universe/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/multiverse/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/main/source/Sources.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/restricted/source/Sources.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/universe/source/Sources.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/multiverse/source/Sources.gz 404 Not Found [IP: 91.189.91.14 80]

Failed to fetch h++p://ppa.launchpad.net/upubuntu-com/office/ubuntu/dists/lucid/main/binary-i386/Packages.gz 404 Not Found

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

The list of software sources in both cases seem to be the same, us.archive.ubuntu.com/ubuntu/dists/karmic-backports/* with an IP of 91.189.91.14 80

I went into "System" -> "Administration" -> "Software Sources" and removed the sources that were referenced.

I then tried to update again through the "Update Manager."

I get past the initial failure (yeah!), but now get:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

This can be caused by: * Upgrading to a pre-release version of Ubuntu * Running the current pre-release version of Ubuntu * Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug using the command 'ubuntu-bug update-manager' in a terminal.

I looked up /var/log/dist-upgrade/apt.log and found several notes indicating a package was being held:

Holding Back indicator-appmenu:i386 rather than change libdbusmenu-glib1:i386
Holding Back libubuntuoneui-3.0-1:i386 rather than change libubuntuone-1.0-1:i386
Holding Back libhangul1:i386 rather than change libhangul-data:i386
Holding Back nabi:i386 rather than change libhangul1:i386
Holding Back gir1.2-ubuntuoneui-3.0:i386 rather than change libubuntuoneui-3.0-1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back rhythmbox-ubuntuone:i386 rather than change gir1.2-ubuntuoneui-3.0:i386
Holding Back unity-scope-musicstores:i386 rather than change rhythmbox-ubuntuone:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386
Holding Back ibus-hangul:i386 rather than change libhangul1:i386

How do I know which packages to remove? Can I do them all? Should I remove them all?

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