How does ubuntu delete a folder?

RM [Options] File
  -F,--force          brute Force Delete, does not require confirmation
  -I                       require confirmation for each deletion of a file or access to a subdirectory
  -I                       ask for confirmation before deleting more than three files or recursively deleting a file
  -R,-r                Recursive Delete subdirectories
  -D,--dir             Delete empty directory
  -V,--verbose     Display Delete results
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The following are commonly used:
rm-d Directory name              #删除一个空目录
RmDir Directory name              #删除一个空目录
Rm-r Directory name              #删除一个非空目录
RM file name                  #删除文件

Go to that folder in the terminal, and then execute:
sudo rm-rf folder name
If it doesn't work, use it.
sudo chmod 777 folder name
sudo rm-rf folder name

How does ubuntu delete a folder?