end kernel panic - not syncing: Attempted to kill init! exit code=0x00007f00

during the update to version 16.04.3 there was a power failure and now, even when I boot from recovery mode, I run into this error (photo 1). I can run Ubuntu from the USB-stick, but I am not offered an option to repair my operating system, and I also don't have access to my files. I already tried boot-repair, but that didn't solve the problem. Given your comment I tried to install Nautilus, but this runs into the following error: (photo 2).