Thanks for your report.
Could you please try the following commands to recover the situation:
sudo apt-get clean
sudo apt-get update
sudo apt-get install --reinstall command-not-found-data
Thanks.
** Changed in: command-not-found (Ubuntu)
Status: New => Incomplete
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package command-not-found-data 0.2.26ubuntu1 failed to install/upgrade:
corrupted filesystem tarfile - corrupted package archive
https://bugs.launchpad.net/bugs/297766
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