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During the installation it mention something about sandbox or something like that. But it continued normally. The installation was interrupted twice by a message that said only 500mb are free, delete some applications, etc. I pressed the option that would have allowed me to do that but never actually opened until the end of the installation were a message announce a mistake that made impossible to finish the process, said the system might be unusable and that a recovery stuff would start but that never happened. I can open some programs like this one and libre office but can not start the software center and the update manager. I've considered downloading the OS from Internet to a CD and reinstall but I know I'll lose all my applications, and documents, I made a backup before so my files are safe but I don't want to install all my apps again. Is there any other way? Thanks for any help or advice you can give me.

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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. When I open the Update manager a message like this one appears. – Afae Set Neram May 17 '12 at 2:30
Please open a terminal then and proceed as the answer suggests -- DO NOT keep trying with Update Manager. – izx May 17 '12 at 12:08

but I don't want to install all my apps again. Is there any other way?

You have no free space. That's why your upgrade failed and you are stuck in an "unusable" state. Please delete files to free up some space -- you can start by deleting the files you already have a backup of -- at least 1-1.5GB is recommended.

Once that's done, open Terminal Ctrl-Alt-T and run sudo apt-get install -f. That may give you errors; if it does, try resuming the upgrade with sudo do-release-upgrade.

Sometimes this won't work either because the system thinks you have upgraded to 12.04 but you are, in fact, stuck half-way. You can do this then:

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
sudo sed -i -e 's/precise/oneiric/g' /etc/apt/sources.list
sudo apt-get update
sudo do-release-upgrade

with a sudo apt-get install -f if that is recommended by apt-get/dpkg.

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I solved this problem. Please see my post on ubuntuforums.

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Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – fossfreedom Oct 21 '12 at 8:05

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