Comment 2 for bug 1687344

Thank you for the report.

The postrm script could not remove the wireshark system group because it is not a system group:

https://launchpadlibrarian.net/317773706/DpkgTerminalLog.txt :
Removing wireshark-common (2.0.2+ga16e22e-1) ...
Purging configuration files for wireshark-common (2.0.2+ga16e22e-1) ...
Removing wireshark group...
The group `wireshark' is not a system group. Exiting.
Could not remove wireshark group.
dpkg: error processing package wireshark-common (--purge):
 subprocess installed post-removal script returned error exit status 128

Most likely the group has been created manually and not by the wireshark-common's postinst.

Please remove the wireshark group manually using:
sudo delgroup wireshark

The root cause of failure in postinst is using "echo" instead of a debconf note and the fix will correct this.