Update problem - yarn install in VM virtual image

Install / Update
,
23

Finally something moves forward.

What I done:

as @tundebabzy suggested (Thank you!)

sudo npm install -g yarn
cd to frappe folder (something like ./apps/frappe. It should contain a yarn.lock file
sudo yarn

after I get lots of new files I do
as @lasalesi suggested (Thank you!)
cd /home/frappe/frappe-bench
$ sudo chown -R frappe:frappe *

then
sudo npm install -g yarn
bench update --requirements
bench setup socketio
bench build

Went trough!

bench update --reset

No success!

frappe@erpnext:~/frappe-bench$ bench update --reset
INFO:bench.utils:updating bench
INFO:bench.utils:git pull
Already up-to-date.
INFO:bench.utils:./env/bin/pip install Pillow
Requirement already satisfied: Pillow in ./env/lib/python2.7/site-packages
Requirement already satisfied: olefile in ./env/lib/python2.7/site-packages (from Pillow)
INFO:bench.app:pulling frappe
INFO:bench.utils:git fetch --all
Fetching upstream
INFO:bench.utils:git reset --hard upstream/master
HEAD is now at c06dfaf Merge branch 'hotfix'
INFO:bench.utils:find . -name "*.pyc" -delete
INFO:bench.app:pulling erpnext
INFO:bench.utils:git fetch --all
Fetching upstream
INFO:bench.utils:git reset --hard upstream/master
Checking out files: 100% (6313/6313), done.
HEAD is now at 93f138e Merge branch 'hotfix'
INFO:bench.utils:find . -name "*.pyc" -delete
INFO:bench.app:pulling erpnext_demo
INFO:bench.utils:git fetch --all
Fetching upstream
INFO:bench.utils:git reset --hard upstream/master
HEAD is now at 5567d19 Merge pull request #25 from neilLasrado/master
INFO:bench.utils:find . -name "*.pyc" -delete
Updating Python libraries...
INFO:bench.utils:./env/bin/pip install --upgrade pip
Requirement already up-to-date: pip in ./env/lib/python2.7/site-packages
INFO:bench.utils:./env/bin/pip install -q -r /home/frappe/bench-repo/requirements.txt
INFO:bench.utils:./env/bin/pip install -q -r ./apps/erpnext/requirements.txt
INFO:bench.utils:./env/bin/pip install -q -r ./apps/erpnext_demo/requirements.txt
INFO:bench.utils:./env/bin/pip install -q -r ./apps/frappe/requirements.txt
Updating node packages...
INFO:bench.utils:yarn install
yarn install v1.3.2
info No lockfile found.
[1/4] Resolving packages...
[2/4] Fetching packages...
info fsevents@1.1.3: The platform "linux" is incompatible with this module.
info "fsevents@1.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
error An unexpected error occurred: "EACCES: permission denied, unlink '/home/frappe/frappe-bench/apps/frappe/node_modules/.bin/_mocha-nightwatch'".
info If you think this is a bug, please open a bug report with the information provided in "/home/frappe/frappe-bench/apps/frappe/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
Traceback (most recent call last):
  File "/usr/local/bin/bench", line 11, in <module>
    load_entry_point('bench', 'console_scripts', 'bench')()
  File "/home/frappe/bench-repo/bench/cli.py", line 40, in cli
    bench_command()
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/frappe/bench-repo/bench/commands/update.py", line 58, in update
    _update(pull, patch, build, bench, auto, restart_supervisor, requirements, no_backup, force=force, reset=reset)
  File "/home/frappe/bench-repo/bench/commands/update.py", line 75, in _update
    update_node_packages(bench_path=bench_path)
  File "/home/frappe/bench-repo/bench/utils.py", line 441, in update_node_packages
    update_yarn_packages(bench_path)
  File "/home/frappe/bench-repo/bench/utils.py", line 454, in update_yarn_packages
    exec_cmd('yarn install', cwd=app_path)
  File "/home/frappe/bench-repo/bench/utils.py", line 143, in exec_cmd
    raise CommandFailedError(cmd)
bench.utils.CommandFailedError: yarn install

Then if I install yarn as before @tundebabzy suggested again then
I have the same problem as this: