I am unable to commit changes in my project when using git.

Here is my terminal:

tomas@tomas-laptop:~/menu_operations$ git commit -m "initial commit"
error: Unable to append to .git/logs/refs/heads/7.x-1.x: Permission denied
fatal: cannot update HEAD ref

menu_operations is the name of my project.

I don't know what permission I have to allow. Can anybody help?

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