result of aptcache

sudo apt-cache policy libboost-all-dev libx11-dev libx11-dev:i386 libxtst-dev libconfig++-dev build-essential qt5-default
[sudo] password for martin:
libboost-all-dev:
  Installed: (none)
  Candidate: 1.65.1.0ubuntu1
  Version table:
     1.65.1.0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
libx11-dev:
  Installed: 2:1.6.4-3
  Candidate: 2:1.6.4-3
  Version table:
 *** 2:1.6.4-3 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status
libx11-dev:i386:
  Installed: (none)
  Candidate: 2:1.6.4-3
  Version table:
     2:1.6.4-3 500
        500 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages
libxtst-dev:
  Installed: (none)
  Candidate: 2:1.2.3-1
  Version table:
     2:1.2.3-1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
libconfig++-dev:
  Installed: (none)
  Candidate: 1.5-0.4
  Version table:
     1.5-0.4 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
build-essential:
  Installed: 12.4ubuntu1
  Candidate: 12.4ubuntu1
  Version table:
 *** 12.4ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status
qt5-default:
  Installed: (none)
  Candidate: 5.9.5+dfsg-0ubuntu1
  Version table:
     5.9.5+dfsg-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages