I have uploaded a broken version (1.8.0-1) of the octave-statistics
package to unstable. It included the nonexistent package octave-datatypes
as a dependency. This has been automatically added to the Depends field
by dh_octave_substvar via the substitution variable ${octave:Depends}.
I apologize for the confusion.
I do know how to proceed now. In the long term, we need to package
octave-datatypes for Debian. I have already created a Git repository for
it at Salsa, but it is still empty (waiting for a push on my side).
In the short term, we could upload a new version (1.8.0-2) without the
dependency on octave-datatypes. I do not know this will impact the
usability of the package. Interestingly, all of the 11,058 unit tests
succeed in the absence of the datatypes package.
What do you think?