@keneda i tried to flash it last. It is funny, that the ubports installer didnt wont to reflash on Win10, but it worked on ubuntu
the storage issue was on /dev/loop0 and after flashing there is 282M again free space. If you use the space carefully it worked for me. I forgot this issue and tried to install more apps and then it crashed.
i try apache with libertine now
btw: every iot device (i.e. esp32) has some webserver capabilities. The power consumtion of the nexus 5 is below 0,5W (25mW in Standby)