I used to run wireshark on ubuntu 17.04 with
~/$ sudo wireshark
but now (just after update to 17.10) when I write the same I get an error
~/$ sudo wireshark
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Invalid MIT-MAGIC-COOKIE-1 keyQXcbConnection: Could not connect to display :0