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Update Ubunu from 12.04 TLS to 14.04.1 TLS



Some week ago I have try to update the version of my Ubuntu Linux.

A tragedy !!!



Everything was fine, but at some point the upgrade is blocked......

W: Impossibile recuperare bzip2:/var/lib/apt/lists/partial/it.archive.ubuntu.com_ubuntu_dists_trusty-updates_main_source_Sources  Somma hash non corrispondente

I tried the following solutions






sudo rm -r /var/lib/apt/lists/* -vf
sudo apt-get update
sudo apt-get autoremove
sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade

see note 

On some computers worked fine but not for all.

For other computers I had to install the new version from dvd