sta and opentimer not getting installed with ./opensource_eda_tool_install.sh

[pushpachiri-ui]

naikpush@PushpaLatest:~/Desktop/vsdflow/OpenSTA-master$ sudo ln -s $PWD/app/sta /usr/bin/sta naikpush@PushpaLatest:~/Desktop/vsdflow/OpenSTA-master$ sta Command 'sta' not found, but can be installed with: sudo apt install opensta naikpush@PushpaLatest:~/Desktop/vsdflow/OpenSTA-master$ sudo apt install opensta Reading package lists... Done Building dependency tree... Done Reading state information... Done **Package opensta is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source

E: Package 'opensta' has no installation candidate**