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A brief electrical outage interrupted my 12.04 upgrade. After many tries, which included trying to upgrade from a command line, I was able to access Ubuntu screens again.

I find that the 12.04 upgrade was indeed not completed; I am still running 11.10. However, Update Manager does not give me the option of installing 12.04 now.

And, when I run Update Manager, I am asked if I want to execute a "partial install." When I answer "yes," I receive the message above. Besides a clean install, any ideas about what can I do to upgrade to 12.04?

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Can you please post output of gedit /etc/apt/sources.list?:) – Tachyons Apr 28 '12 at 7:01

Try running sudo apt-get dist-upgrade.

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It means your upgrade crashed during the failed system upgrade.

Try this:

  1. Press Ctrl+Alt+T to open a Terminal window.

  2. Run these commands:

    sudo rm -rf /var/lib/apt/lists/*
    sudo apt-get update

    That might be sufficient to fix the problem. If not, continue on...

  3. Run the command

    gksu gedit /etc/*release

    and change everything in the file gedit brings up to:

    DISTRIB_DESCRIPTION="Ubuntu 11.10"

    Save the file.

  4. Then run this command.:

    gksu gedit /etc/*issue

    And change the file to to:

    Ubuntu 11.10 \n \l

Now open the Update Manager and upgrade the OS as usual.

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yes when I was upgrading and it crashed.I tried in terminal sudo rm -rf... and nothing, tried the next one lsb_ rel... and it said release: 12.04 codename :precise Thanks for your helps – CARLOS Apr 16 '12 at 3:12
Please post output of gedit /etc/apt/sources.list – Tachyons Apr 16 '12 at 3:51

Did you try sudo do-release-upgrade -d?

You didn't say if you're running a 32-bit or 64-bit system, as there are known issues with either involving ia32-libs and multiarch in upgrading to 12.04 beta2. (I assume you're upgrading to beta2?)

Detailed information is at:

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protected by Community Jul 19 '12 at 6:27

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