/data/data/com.termux/files/usr/bin/startxfce4: X server already running on display :0xrdb: Connection refusedxrdb: Can't open display ':0'dbus-update-activation-environment: error: unable to connect to D-Bus: /data/data/com.termux/files/usr/bin/dbus-launch terminated abnormally with the following error: dbus-launch: No existing session bus was found, and failed to connect to X11 display.
xfce4-session: Cannot open display: .Type 'xfce4-session --help' for usage.