SHELL

git remove submodule

# Remove the submodule entry from .git/config
git submodule deinit -f path/to/submodule

# Remove the submodule directory from the superproject's .git/modules directory
rm -rf .git/modules/path/to/submodule

# Remove the entry in .gitmodules and remove the submodule directory located at path/to/submodule
git rm -f path/to/submodule

git submodule remove

# Remove the submodule entry from .git/config
git submodule deinit -f path/to/submodule

# Remove the entry in .gitmodules and remove the submodule directory located at path/to/submodule
git rm -f path/to/submodule

# Remove the submodule directory from the superproject's .git/modules directory
rm -rf .git/modules/path/to/submodule

#Remember to commit the remove change!
git commit -m "removed submodule"

git remove submodule keep files

mv subfolder subfolder_tmp
git submodule deinit subfolder
git rm --cached subfolder
mv subfolder_tmp subfolder
git add subfolder

git remove submodule

Option 1.
Remove .gitmodules file from project

Option 2.
rm -rf .git/modules/path_to_submodule

Remember to commit the remove change!