Bug#1030096: #1030096 dask.distributed autopkgtest fail

[Rebecca N. Palmer]

I have an attempt to fix this in Salsa now (in my fork), but it hasn't 
had time to run the tests yet, so I don't know whether it works.

Note the above mention that if we lose dask.distributed then we lose 
Spyder, which makes this a bigger issue than I initially thought.