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I have a problem updating Ubuntu 12.04 LTS, I have lost Internet connection while installing flash plugin, but I have recovered the Internet connection but it has not continue the installation with 20 minutes left.

Thank you.

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Try the following commands:

sudo apt-get autoremove
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade

This will remove any unnecessary and partially downloaded files and upgrade all the files.

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