plainbox-provider-checkbox cannot be installed due to stress-ng dependency error

[Kristin Chuang]

[steps]
1. Try installing plainbox on a Trusty system (which has been upgraded from 14.04 OSP1 3.19 kernel to 4.4.0-57-generic kernel) using QA installation tool (boxer).
2. Check if installation is successful

[expected]
installation should be successful

[actual]
installation unsuccessful, error message shows that the failure was due to "plainbox-provider-checkbox" package's dependency on "stress-ng" package (which is currently uninstalled)

[Kristin Chuang (kristinchuang)]

Error message says:

The following packages have unmet dependencies:
 plainbox-provider-checkbox : Depends: stress-ng (>= 0.04) but it is not going to be installed

Detailed installation log please refer to
https://pastebin.canonical.com/174706/

[Kristin Chuang (kristinchuang)]

More logs in :
https://pastebin.canonical.com/174707/

$ apt-cache policy stress-ng # returns info saying that stress-ng is not installed

$ sudo apt-get install stress-ng # blocked by another libapparmor1 dependency issue

[Pierre Equoy (pieq)]

The problem was due to a version of stress-ng (0.07) in the Hardware Certification PPA for Trusty that had dependency problems.

Since on Trusty, Checkbox does not rely on stress-ng to perform stress tests (CPU tests use the older stress, memory uses memorycheck, and the disk tests use bonnie++), the package version was downgraded to 0.05 to maintain compatibility.

[Kristin Chuang (kristinchuang)]

Plainbox-provider-checkbox 0.33.0~ppa~ubuntu14.04.1 successfully installed into a Trusty system (with 4.4 kernel)[1] via QA installation tool (boxer).

Detailed version info of installed plainbox & stress-ng packages at http://pastebin.ubuntu.com/23750933/.

[1]
HW: Somerville 201506-18536
Image: This platform's A00 image (build 20150916-1)
Updated to 4.4 kernel: via KH3 method