Comment 4 for bug 1642887

The Debian package of 1.2.1 is in Alioth awaiting sponsorship; once uploaded there it will automatically be imported to Ubuntu zesty (current development), but not existing releases.

This might work in 16.04, but has *not* been tested:

git clone https://anonscm.debian.org/cgit/pkg-opencl/beignet.git
cd beignet
sudo apt-get install build-essential debhelper cmake libgl1-mesa-dri clang-3.8 libclang-3.8-dev llvm-3.8-dev ocl-icd-dev ocl-icd-opencl-dev pkg-config python3 libdrm-dev libxext-dev libxfixes-dev libx11-dev ikiwiki
#-d because clang-3.9 isn't available or needed in xenial
dpkg-buildpackage -us -uc -d
sudo dpkg -i beignet*.deb

I don't see any reported 1.2.0 -> 1.2.1 regressions on the upstream mailing list or bug tracker; I do see at least one 1.1 -> 1.2.0 regression, but zesty and Debian already have 1.2.0.