Linux setup issue with starboard for Cobalt

I recently stumbled on to cobalt while I was looking to port my web application to android. I followed these steps on my Linux system. I was able to complete the 'Set up your workstation' and 'Set up Developer Tools' sections.

While building, on the following line

~/cobalt$ python3 cobalt/build/gn.py -p linux-x64x11

I get the following error messages

:~/cobalt2$ python3 cobalt/build/gn.py -p linux-x64x11
gn --script-executable=/home/vermaayu/.virtualenvs/cobalt_dev/bin/python3 gen out/linux-x64x11_devel
Build Accelerator: ccache
ERROR at //starboard/tools/BUILD.gn:18:15: Script returned non-zero exit code.
  file_list = exec_script(script, [ "-l" ], "trim string")
              ^----------
Current dir: /home/vermaayu/cobalt2/out/linux-x64x11_devel/
Command: /home/vermaayu/.virtualenvs/cobalt_dev/bin/python3 /home/vermaayu/cobalt2/starboard/tools/app_launcher_packager.py -l
Returned 1.
stderr:

Traceback (most recent call last):
  File "/home/vermaayu/cobalt2/starboard/tools/app_launcher_packager.py", line 30, in <module>
    from starboard.tools import command_line
ModuleNotFoundError: No module named 'starboard.tools'

See //starboard/BUILD.gn:72:5: which caused the file to be included.
    "//starboard/tools:build_app_launcher_zip",
    ^-----------------------------------------
Traceback (most recent call last):
  File "/home/vermaayu/cobalt2/cobalt/build/gn.py", line 99, in <module>
    main(builds_out_directory, known_args.platform, known_args.build_type,
  File "/home/vermaayu/cobalt2/cobalt/build/gn.py", line 51, in main
    subprocess.check_call(gn_command)
  File "/usr/lib/python3.10/subprocess.py", line 369, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['gn', '--script-executable=/home/vermaayu/.virtualenvs/cobalt_dev/bin/python3', 'gen', 'out/linux-x64x11_devel']' returned non-zero exit status 1.

This and this, I found to be different issues than mine.

I have installed GN. I am not big on GN or GYP and limited knowledge on python.
I have tried 2 different LTS builds from Github. Looked for similar issues with starboard but didn't find much.
Any help would be appreciated. Thanks.

The issue you are running into is with Python script that is invoked by GN is not finding the code modules it needs ( starboard ) from the current directory.

export PYTHONPATH=$PWD should solve this.

It's also mentioned in step 6) of the instructions you linked to.