How To Fix This Error: 'E: Unable to fetch some archives [...]' - Ubuntu 11.10/12.04

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Sometimes, while trying to install a package under Ubuntu 12.04/11.10 from the official Ubuntu repository using this command:

sudo apt-get install <package>

we get this error in the terminal:

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

To fix this problem, you need to do the following:

Open the Ubuntu Software Center and head to Edit > Software Sources:

Under the "Ubuntu Software" tab, make sure the "Download from: Main Server" option is selected:

Move on to the "Other Software" tab and make sure that these options are well enabled:

• Canonical Partners
• Canonical Partners (Source Code)
• Independent
• Independent (Source Code)

Close the window and then run this command from the terminal:

sudo apt-get update

Try now to reinstall your package. This tip is also suitable for non-English Ubuntu distros.

Good luck!