this seems to be a gdebi bug. bad package? maybe re-installation helps
Setting up python3 (3.6.7-1~18.04) ...
running python rtupdate hooks for python3.6...
dpkg-query: package 'gdebi-core' is not installed
Use dpkg --info (= dpkg-deb --info) to examine archive files,
and dpkg --contents (=
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: python3-defaults (Ubuntu)
Status: New => Confirmed
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** Tags removed: need-duplicate-check
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Title:
package python3 3.6.7-1~18.04 failed to install/upgrade: installed
python3 package