Long pause duign apt updates

[Peter Flynn]

Why is there always a loooooong pause (at leasta  minute, maybe more) at
THIS exact stage of any apt or apt-get upgrade:

Processing triggers for shared-mime-info (1.5-2ubuntu0.1) ...
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'

Is there something going on that need fixing? This has been happening on
everything from 16.04 onwards, and it happens on Ubuntu-based systems
like Mint as well.

///Peter