ZMK is not available in the latest Ubuntu LTS. For uses of the more
recent Debian, Ubuntu or Fedora systems the version in the archive is
sufficient. For the rather more popular Ubuntu LTS users _and_ the users
of other systems, we can offer something that gets them working quickly.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>