The VNC sidecar builds its .vnc/passwd rfbauth file with `vncpasswd -f` (vnc-manager.ts) — x11vnc alone doesn't ship vncpasswd. The GNOME-on-Xorg rewrite dropped tigervnc, so the mirror couldn't create its password and /desktop failed with "VNC password not configured". Add tigervnc-common back. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>