Thanks for filing this bug in Ubuntu.
As the logs say, it looks like your libkrb5-26-heimdal package is in a
bad state. Please try to reinstall it:
sudo apt update
sudo apt install --reinstall libkrb5-26-heimdal
** Changed in: heimdal (Ubuntu)
Status: New => Incomplete
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package libkrb5-26-heimdal:amd64 1.7~git20150920+dfsg-4ubuntu1.16.04.1
failed to install/upgrade: package is in a very bad inconsistent
state; you should reinstall it before attempting configuration
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