Wireshark · Wireshark-users: Re: [Wireshark-users] Gtk-WARNING **: cannot open display:

[Guy Harris <guy@xxxxxxxxxxxx>]

Robert D. wrote:
> well, after the reboot, when I click wireshark, there are (again) no
> interfaces from which to capture .. most annoying since I seem to be
> occasionally able to run it in the right permission level

If you fixed the problem by manually changing the permissions on the BPF 
devices, that doesn't persist after a reboot (because /dev isn't on 
disk, it's in an in-memory "device file system" which gets destroyed on 
shutdown and rebuilt after a boot).  See my other mail with the ChmodBPF 
startup item for a way to arrange to have the permissions changed every 
time you boot.