Thanks for your report.
You can recover from a corrupted archive with the following commands:
sudo apt-get clean
sudo apt-get update
sudo apt-get install --reinstall language-pack-ar-base
Tell us if this helps.
** Changed in: language-pack-ar-base (Ubuntu)
Status: New => Incomplete
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Installation via Language Support failed
https://bugs.launchpad.net/bugs/301266
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