Thanks for your bugreport.
What is the output of:
$ md5sum /var/cache/apt/archives/libegroupwise1.2-13_2.26.1-0ubuntu2_amd64.deb
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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package libegroupwise1.2-13 2.26.1-0ubuntu1 failed to install/upgrade:
corrupted filesystem tarfile - corrupted package archive
https://bugs.launchpad.net/bugs/394655
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