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This is most likely the case of another dnf process is launched silently. It could be launched by Software to check for and install updates, etc.

Suggest you do the following: ps aux | grep 3376

It will most likely show a 'dnf' process.

Then, kill -9 3376. This might ask for authentication. Provide the password, etc.

Now, launch sudo dnf install vlc

It should work.