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As u can see. At first its permission denied . And now "Unable to handle "admin: " locations.
You need to add admin:// to the beginning of the full path to your preferred file to use the GVfs admin backend.
Since you're trying to open the /etc/sysctl.conf file, you need to run
sudo apt install gvfs-backends
Well, I don't know what was wrong but going manually through cd /etc and using sudo nano sysctl.conf to edit solved my issue.
sudo nano sysctl.conf
Required, but never shown