Comment 6 for bug 306591

refdoc:

Your locale list includes ar_EG.utf8, but not ar_EG.
These are two different locales.

Please try:

    # Create and install the ar_EG locale
    sudo locale-gen ar_EG
    # Test it
    LC_ALL=ar_EG locale

I think this will fix your issue, which is not the bug described by the submitter, but something else.

Jonathan