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According to what you've posted as output of grep remove /var/log/dpkg.log, you've uninstalled most of ROS on 2020-04-04 (ie: three days ago) around 6pm (your time).

Why, I cannot say.

So concluding:

should i reinstall ros?

yes, that would seem to be necessary.

You can try and see whether sudo apt update && sudo apt install ros-melodic-desktop-full works.

I suspect it won't, but let's see.