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The problem started when I was trying to download the 12.04 Beta 1 but didn't have sufficient time to complete the install. As I try to upgrade or re-download 12.04 I get the message "Not all updates can be installed" with the choice to Partial Upgrade or close.

Partial Upgrade gives me:

An upgrade from 'precise' to 'oneiric' is not supported with this tool.

Close gives me:

Software index is broken

It is impossible to install or remove any software. Please use the package manager "Synaptic" or run "sudo apt-get install -f" in a terminal to fix this issue at first.

The Synaptic suggestion doesn't work as well. The command gives me

E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

Any suggestions?

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up vote 2 down vote

Here is what worked for me:

sudo -i

and then 

dpkg --configure -a

That worked, and I could now run the command:

apt-get dist-upgrade
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i had shutdown the system due to hang up when it was upgrading ubuntu. the system didnt start up. then i restored to earlier-> dwonloaded broken packages but not able to upgrade-> it said no latest version available n the upgrade had not completed. so finally followed this n it worked. so, +1 – Angelin Nadar May 16 '12 at 4:47
up vote 4 down vote

You can open a terminal and enter sudo dpkg --configure -a.

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