when i enter this line
$ sudo apt-get install autoconf automake bison build-essential curl git-core libapr1 libaprutil1 libc6-dev libltdl-dev libreadline6 libreadline6-dev libsqlite3-0 libsqlite3-dev libssl-dev libtool libxml2-dev libxslt-dev libxslt1-dev libyaml-dev ncurses-dev nodejs openssl sqlite3 zlib1g zlib1g-dev
onto the terminal. It return this error
E: Package 'libreadline6' has no installation candidate
I'm using Ubuntu 18.04(bionic) btw
