Hi Michael,
I experienced a similar error message after Nvidia driver upgrade on Mint 18
(Debian - Ubuntu based):

[opencl_init] could not create context for device 0: 999
In my case I tracked it down to incorrect file ownership of /home/
myusername/.nv
You can see my fix as well as how I managed to troubleshoot it in the last
comment here:
https://redmine.darktable.org/issues/11599
(https://redmine.darktable.org/issues/11599)
Hope you find it helpful.
Cheers, Tomas

"Only problem is that darktable-cltest finds everything as expected but 
ends up with this error:
[opencl_init] could not create context for device 0: 221
(oclDeviceQuery runs as expected)

"
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