I am having an access problem to some files and directories that I have tracked down to the group assigned to access them.
When I manually change the name of the group in the properties/permissions menu for a directory from the default setting (MyGroup) to www-data used by my Drupal Website, the directory error messages I get are gone.
There are a large number of files and directories that require this change. If believe using chmod will change the owner which is set correctly and being new to Ubuntu, I am reluctant to experiment without a better understanding of how owner and groups work in the permissions settings.
What command changes the Group setting for a directory?