Sigh... why did you enable the camera when it was already enabled, on first run the app can't detect whether the cam is enabled or disabled... Code: flasher-3.5 --set-rd-flags=no-lifeguard-reset should at least get your device to boot up, no you won't lose data. Post the output of cat /etc/X11/Xession.post/17camera-ui and ls -l /usr/bin/camera*
flasher-3.5 --set-rd-flags=no-lifeguard-reset