xray-core
download this from this link:
extract this file in ~/.local/bin/ .
Qv2ray gui
download from this link:
extract it in ~/.local/bin/ folder and give it permissions .
open Qv2ray gui (give it executable permission)
open preferences tab . navigate to kernel tab . there are two select buttons . for first one give it xray-core executable which you extracted . for second one give the parent folder path of xray-core executable file .