ERPNext installation issues Ubuntu 20.04

Error, again!

Summary

ERROR:
Traceback (most recent call last):
File “/usr/local/bin/bench”, line 8, in
sys.exit(cli())
File “/usr/local/lib/python3.8/dist-packages/bench/cli.py”, line 121, in cli
raise e
File “/usr/local/lib/python3.8/dist-packages/bench/cli.py”, line 111, in cli
bench_command()
File “/usr/lib/python3/dist-packages/click/core.py”, line 764, in call
return self.main(*args, **kwargs)
File “/usr/lib/python3/dist-packages/click/core.py”, line 717, in main
rv = self.invoke(ctx)
File “/usr/lib/python3/dist-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/usr/lib/python3/dist-packages/click/core.py”, line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/usr/lib/python3/dist-packages/click/core.py”, line 555, in invoke
return callback(*args, **kwargs)
File “/usr/local/lib/python3.8/dist-packages/bench/commands/make.py”, line 142, in get_app
get_app(
File “/usr/local/lib/python3.8/dist-packages/bench/app.py”, line 371, in get_app
app.install(verbose=verbose, skip_assets=skip_assets, restart_bench=restart_bench)
File “/usr/local/lib/python3.8/dist-packages/bench/utils/render.py”, line 110, in wrapper_fn
return fn(*args, **kwargs)
File “/usr/local/lib/python3.8/dist-packages/bench/app.py”, line 198, in install
install_app(
File “/usr/local/lib/python3.8/dist-packages/bench/app.py”, line 436, in install_app
bench.reload()
File “/usr/local/lib/python3.8/dist-packages/bench/utils/render.py”, line 110, in wrapper_fn
return fn(*args, **kwargs)
File “/usr/local/lib/python3.8/dist-packages/bench/bench.py”, line 142, in reload
restart_supervisor_processes(bench_path=self.name, web_workers=web)
File “/usr/local/lib/python3.8/dist-packages/bench/utils/bench.py”, line 280, in restart_supervisor_processes
bench.run(f"{sudo}supervisorctl restart {group}")
File “/usr/local/lib/python3.8/dist-packages/bench/bench.py”, line 43, in run
return exec_cmd(cmd, cwd=cwd or self.cwd)
File “/usr/local/lib/python3.8/dist-packages/bench/utils/init.py”, line 126, in exec_cmd
raise CommandFailedError
bench.exceptions.CommandFailedError

I’ve removed site (bench drop-site …)
tried again, just errors and errrors.

Can someone help me out here, why I get errors, I followed the tutorial: ERPNext-installation-Guide The complete guide to install ERPNext in your Ubuntu system
Still, I don’t have ERPNext running in production.