lighthttpd won't install - Depends: libssl1.1 (>= 1.1.0) but it is not going to be installed

I see two options:

• Try to install libssl manually (the exact version from official repository):

  sudo apt install libssl1.1=1.1.0g-2ubuntu4.3
  

• Remove ppa:ondrej/php from the system:

  sudo apt install ppa-purge
  sudo ppa-purge ppa:ondrej/php
  

  and then install lighttpd

  sudo apt install lighttpd