The problem manifests like this:
If you have installed cygwin and used it before, the relevant user directory will appear in the cygwin/home/ directory, for example: cygwin/home/User001.
Then you reinstall the system, and when you use cygwin again, a new user folder is created, for example: cygwin/home/User002.
At this time, the problem comes, the previous User001 cannot be deleted, even if the command rm -rf User001 is used in cygwin, it cannot be deleted (the permission is not enough), and the old user folder is modified by chmod 777 User001 , and the permission is not enough.
Solution:
Right-click to run Cygwin.bat with administrator privileges , and then delete it through the command rm -rf. If it still cannot be deleted, use chmod 777 to modify the permissions and then delete it.