ncurses5 required for rabbit install 20.04

[craig8]

Describe the bug

craig8@WE48687:~$ sudo dpkg -i esl-erlang_25.2-1~ubuntu~focal_amd64.deb
Selecting previously unselected package esl-erlang.
(Reading database ... 39076 files and directories currently installed.)
Preparing to unpack esl-erlang_25.2-1~ubuntu~focal_amd64.deb ...
Unpacking esl-erlang (1:25.2-1) ...
dpkg: dependency problems prevent configuration of esl-erlang:
 esl-erlang depends on libncurses5; however:
  Package libncurses5 is not installed.

dpkg: error processing package esl-erlang (--install):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 esl-erlang

[schandrika]

We should probably remove the pre-requisite step from readme and include blanket statement to the effect "based on your operating system erlang might need other system level libraries as dependencies. apt-install of erlang will fail with appropriate error message pointing the right dependencies" what do you think?