This is because running Wireshark as root potentially puts you at risk, as it could compromise your computer in the event that a malicious packet was intercepted or willingly sent to the capture device.
I'm converting this to a question, in order to provide the information on how to deal with this special case.
Indeed, it is no longer there is the package, so this is "expected" behavior, upgrade or otherwise...
Apparently, this was done in the Debian packaging in version 1.2.1-2:
wireshark (1.2.1-2) unstable; urgency=low
* added option to install dumpcap with setuid root root.desktop to discourage running Wireshark as root
* removed wireshark-
* dropped umask patch
-- Balint Reczey <email address hidden> Tue, 28 Jul 2009 18:30:03 +0200
This is because running Wireshark as root potentially puts you at risk, as it could compromise your computer in the event that a malicious packet was intercepted or willingly sent to the capture device.
I'm converting this to a question, in order to provide the information on how to deal with this special case.