French native, I have joint Ubuntu Mate users today. Since then, I cannot pass from english to french language using the language support display. I got a message that says " failed to download package files. Check your internet connection." But , to me , my internet connection seems ok as I can browse on any sites without problem. Thanks for any clue that can fix this issue.
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Most probably, the site your system tries to get language files from does not respond. You cat try to select another repository mirror using System > Administration > Software and updates dialogue.
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Hi, @esote and welcome to the Ubuntu MATE Community!
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Thank you ugnvs! Ill dig in that direction.
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Hi, Bombilla, I appreciate.
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If you switch sites, as Eugene advised, you should be able to find one that does respond and download the requested files.
Once that is done, you can then make your choice from the list that will be presented in the upper box, as seen below:
Be sure to click on "Apply System-Wide", if you want you complete experience in your preferred language. 
Note that if an Application does not support your language of choice, the fallback will likely be English (distro default).
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Hi Eric. Yes , finally, I managed to solve the issue throw the update manager display that made my system able to work correctly. Thanks for everyone who helped.
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Hey, welcome to the forums/community ! Glad you could solve the issue - also, if you could please flag the comment that was most helpful as the "Solution" as you may see in the bottom right side of every comment it would help others that search the forums know that the problem could easily be solved by whatever the comment suggested 
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