How to uninstall Gromacs 2020.6?

GROMACS version:2020.6
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Hi this is manoj , i was uninstalling my gromacs cause i want to reninstall it again so when i try to uninstall it I’m getting the same error again & again,So anyone who knows how to uninstall it please help me out.I have tried below methods but got same error
sudo apt-get remove gromacs sudo apt-get remove --auto-remove gromacs
sudo apt-get purge gromacs sudo apt-get purge --auto-remove gromacs
Below is the image showing the error.

How did you install GROMACS? If you installed it using the package manager, you can use the same (apt or apt-get) to remove it. However, if you installed it manually, that won’t work.