few points.
1. libtraceevent will be using files from "/sys/kernel/debug/tracing/events" 
which might or might not be available depending on debugfs is mounted or not.

2. The build is usually done in a schroot and the schroot will not have
its own kernel, so it will use /sys/kernel/ of the host and the tests
during build time might fail depending on if it can access
"/sys/kernel/debug/tracing/events" or not. In my local schroot, the
builds can not access "/sys/kernel/debug/tracing/events".

3. In autopkgtest, the tests will work for Ubuntu as Ubuntu autopkgtests
are run in a VM, but Debian autopkgtests are run in a lxc container
which again will not have its own kernel. So, enabling tests for
autopkgtest needs to stay as an Ubuntu delta.

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https://bugs.launchpad.net/bugs/2055258

Title:
  No test suite run at built time nor as autopkgtest

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