hyperspy currently FTBFS with several failing tests:
https://launchpadlibrarian.net/678551154/buildlog_ubuntu-mantic-amd64.hyperspy_1.7.3-1_BUILDING.txt.gz

the old and new hyperspy  is not compatible with imagio > 0.28.

I kindly opened a bug report about the situation at the upstream git repository.

Dear submitter,

as the package hyperspy has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1121265

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Joerg Jaspert (the ftpmaster behind the curtain)