Hello,
today I’ve got an update. Web-server is back. But UI got an error too.
“Web proxy stats” meny item open a new instance of UI in the main frame. So I can do this:
screenshot
P.S. Sorry if I post it wrong place 
Upd: ntopng also doesn’t start from the box with next messages in the log:
systemd: Started Start/stop ntopng program.
Jul 14 21:59:50 hostname systemd: ntopng.service holdoff time over, scheduling restart.
Jul 14 21:59:50 hostname systemd: Starting Start/stop ntopng program…
Jul 14 21:59:50 hostname logger: ntopng start
Jul 14 21:59:50 hostname ntopng: Starting ntopng: /usr/bin/ntopng: error while loading shared libraries: libzmq.so.4: cannot open shared object file: No such file or directory
Jul 14 21:59:55 hostname ntopng: Unable to start ntopng[FAILED]
Jul 14 21:59:55 hostname logger: ntopng stop
Upd2: Don’t know if someone reported it. ‘Graphs’ doesn’t work:
screenshot
web browser console output:
screenshot
