This is the ubuntu 16.04 version of ubuntu-upstart。
Latest docker image for ubuntu-upstart
In case you still need to use upstart in 16.04 in docker for whatever reason.
Run the image:
docker run --cap-add=SYS_PTRACE cxmcc/ubuntu-upstart:16.04
If this still does not work, try using --privileged flag or look into your apparmor logs.
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