It is unlikely that there are deb packages for ARM. You are on your own and need to find a way to compile KMS from source. I unfortunately lost my interest in this media server, but a while ago I did this for a 6.16 version https://gist.github.com/neilyoung/bc67892ec79a0f8de44b46642e7dceeb
Note: This gist is outdated and only works for 6.x versions. I never tried to compile a 7.x version on ARM. But I know it is possible to compile it from source on AMD64.
Please also note this: Kurento Media Server (KMS) is compiled and provided for installation by the Kurento team members, in a variety of forms. The only officially supported processor architecture is 64-bit x86, so for other platforms (such as ARM) you will have to build from sources.