Document changes and release 21.2.6-1pureos1 into byzantium

5 jobs for byzantium-21.2 in 40 minutes and 39 seconds (queued for 2 seconds)
Name Stage Failure
failed
lintian-pureos-byzantium-package Test Package
N:   
N: Check: shared-libs
N:
N: Renamed from: shlib-without-versioned-soname
N:
W: mesa-vulkan-drivers: shared-library-lacks-version usr/lib/x86_64-linux-gnu/libVkLayer_MESA_overlay.so libVkLayer_MESA_overlay.so
W: mesa-vulkan-drivers: shared-library-lacks-version usr/lib/x86_64-linux-gnu/libvulkan_lvp.so libvulkan_lvp.so
N: 6 hints overridden (6 warnings); 1 unused override
ERROR: Job failed: exit code 1