Hello, I'm trying to install ESET on my pc but it has the following error:  walter.santos@DKTP-0RN1-SA:~/Downloads$ sudo ./eset_nod32av_64bit_pt_br.linux No protocol specified (eset_nod32av_64bit_pt_br.linux:18763): Gtk-WARNING **: 20:59:26.204: cannot open display: :0 Can anybody help me? Hw Specs: Dell Optiplex 380 Proc: Pentium(R) Dual-Core CPU E5400 @ 2.70GHz × 2  Mem: 3GB Sw Spec: S.O:  Zorin OS 15.2 (Ubuntu Based) Type: 64 bits