Since Alex was on Ubuntu, the solution was to download the official V2Ray core from GitHub or use a community script:
The error vanished. The proxy worked.
v2ray --version Same result: command not found . The truth dawned: Since Alex was on Ubuntu, the solution was
Alex searched online and found the key insight: Qv2ray does not bundle V2Ray. You must install it separately. The truth dawned: Alex searched online and found
Here’s a short, useful story that explains the error and how to fix it. The Case of the Missing Kernel The Case of the Missing Kernel which v2ray Nothing
which v2ray Nothing. Then:
Alex had just installed Qv2ray, a sleek GUI for managing V2Ray proxies. It looked promising. But when Alex clicked “Start,” a red error popped up: “V2Ray kernel failed to start: v2ray core executable not found.” “What does that mean?” Alex wondered. “I installed Qv2ray. Isn’t that enough?”