Ubuntu LTS has no native support for HID-over-GATT, and therefore you have to first
install the Nordic Voice System (NVS) package to support the HID-over-GATT
profile.
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Download the NVS package nvs-4.4.tgz from the Smart Remote 3 for nRF51 start page.
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Open a terminal (CTRL + ALT + T).
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Navigate to the folder where nvs-4.4.tgz is located.
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Unpack the nvs-4.4.tgz file by typing tar -xf
nvs-4.4.tgz.
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Open the file nvs-4.4/binaries/HOWTO-install.txt and
follow the steps there to complete the installation.