Update permission error

hi community i get this error today when i tried to update from v8.1 to v8.2

root@ubuntu:/home/frappe/frappe-bench# bench update
INFO:bench.utils:updating bench
INFO:bench.utils:git pull
remote: Counting objects: 8, done.
remote: Compressing objects: 100% (2/2), done.
remote: Total 8 (delta 6), reused 8 (delta 6), pack-reused 0
error: insufficient permission for adding an object to repository database .git/objects
fatal: failed to write object
fatal: unpack-objects failed
Traceback (most recent call last):
File “/usr/local/bin/bench”, line 11, in
load_entry_point(‘bench’, ‘console_scripts’, ‘bench’)()
File “/home/frappe/.bench/bench/cli.py”, line 40, in cli
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/bench/commands/update.py”, line 35, in update
File “/home/frappe/.bench/bench/utils.py”, line 246, in update_bench
exec_cmd(“git pull”, cwd=cwd)
File “/home/frappe/.bench/bench/utils.py”, line 130, in exec_cmd
raise CommandFailedError(cmd)
bench.utils.CommandFailedError: git pull

any help

i run this commands and worked for me

sudo chown -R frappe:frappe /home/frappe/.bench
sudo chown -R frappe:frappe /home/frappe/frappe-bench
cd /home/frappe/.bench
git reset --hard
git pull
cd /home/frappe/frappe-bench
bench update