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**

[pushpachiri-ui]

nfo-SDC: Categorizing output ports as bits and bussed

Info: SDC created. Please use constraints in path /home/naikpush/Desktop/vsdflow/outdir_spi_slave/spi_slave.sdc

Starting synthesis using qflow

Synthesis finished with errors

Please review log file "/home/naikpush/Desktop/vsdflow/outdir_spi_slave/log/synth.log" for errors/warnings

Info: Please find the synthesized netlist for spi_slave at below path. You can use this netlist for STA or PNR

/home/naikpush/Desktop/vsdflow/outdir_spi_slave/synthesis/spi_slave_synth.rtlbb.v
error copying "/home/naikpush/Desktop/vsdflow/outdir_spi_slave/synthesis/spi_slave.rtlnopwr.v": no such file or directory
while executing
"file copy -force $OutputDirectory/synthesis/${DesignName}.rtlnopwr.v $OutputDirectory/$DesignName.final.synth.v "
(file "vsdflow.tcl" line 410)