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I've a WDS server running Windows 2012 Server and I just uploaded Windows 2012 R2 images to the WDS server.

Changed the boot.wim image to the one in the 2012 R2 ISO, but after this change, I was unable to select, for example, English (US) as default language. An error message appears with the following text:

Failed to set the selected language as UI language.

I can continue the installation with other language, but this is an annoyance. Another test was done rolling back the old boot.wim image from WS2012 but with this image I was unable to install WS2012 R2.

Some folks appears to be with the same issue as described here: http://social.technet.microsoft.com/Forums/windowsserver/en-US/681149bd-a204-48d4-ae93-557c1b950bfc/failed-to-set-teh-selected-language-as-ui-language?forum=winserversetup

The same problem happens if I take a boot image from Windows 8.1 for example.

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Do you have an answer file as referenced in your link? If so it may be trying to install a US Language pack that isn't present. This was my first thought before even seeing your link. –  Brad Bouchard May 1 '14 at 19:55
Nope, we don't use answer files. –  Vinícius Ferrão May 1 '14 at 20:38
Figured... but had to ask. Have you thought of setting up Server 2012 with the US Language pack installed then sysprep'ing and re-capturing this as your new boot.wim? It sucks to have to do that, but it is one option until MS addresses it. –  Brad Bouchard May 1 '14 at 20:39

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