The user is experiencing an issue while using the 'cat' command in Ubuntu, specifically with the file 'hello_world.py', which is reported as missing. They have recently installed Linux and Ubuntu on their laptop and are unsure if they need to reinstall the operating system or if there is another underlying problem causing the issue.

1. Coursera learning python interacting with operating system.
Using Ubuntu when trying a command:
cat hello_world.py Got this message: cat: hello_world.py:
no such file or directory just install linux and ubuntu on my lap top it cant find any file.
Do I need to re install it, or may be something else wrong.