Ubuntu 16.10 (yakkety) reached end-of-life on July 20, 2017.
However, in 17.10 it appears you can go to:
All Settings > Language Support
Then configure your preferred language and then click "Apply System-Wide".
If this does not work, then please upgrade to a supported Ubuntu version before
** Changed in: gdm3 (Ubuntu)
Status: Confirmed => Incomplete
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wrong keyboard layout in gdm
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