Folder not deleted from root folder with root user

check the /root/.bashrc script

you can check the aliases are created or not for some commands like kill,killall,chattr

if you found anything like this then remove  it

then write the below command to check the attributes of the folder which is not deleted.

lsattr /root/.folder_name

if this will show the output like
----i-----e-----  /root/.folder_name

you can follow the article below

Attribute “i“

Sometimes it might be very useful to render a file immutable – nobody (not even the root user) will be able to edit, rename, move or delete this file. The way to do that on a Linux file system is by using file attributes (also called flags) and more specifically the “i“-immutable file attribute.

On a Linux system, there are two commands for working with file attributes. These are:

• chattr – this is the command, which is used to set file attributes to files. Some attributes, including the immutable attribute can only be set by the superuser.
• lsattr – this is the command that is used to display the attributes currently set for a file.

I will illustrate the use of file attributes by the simple example below:

We create an empty file:

root@server:~# touch example.txt

Let’s list the current attributes of this file:

root@server:~# lsattr example.txt
-----------------e- example.txt

As you can see the only flag set for this newly created file is the “e” flag which is on by default for all Linux files on an ext4 file system.

Now, let’s set the “i” flag for this file. Remember that by default, only a superuser can do this:

root@server:~# chattr +i example.txt

Let’s list the attributes now:

root@server:~# lsattr example.txt
----i------------e- example.txt

As you can see the “i” flag is visible now.

To test the functionality, I will try to modify the file in several ways:

root@server:~# mv example.txt renamed.txt
mv: cannot move `example.txt' to `renamed.txt': Operation not
permitted

root@server:~# rm -f example.txt
rm: cannot remove `example.txt': Operation not permitted

root@server:~# echo "Some string" > example.txt
bash: example.txt: Permission denied

As can be seen from the above examples, we cannot move, delete or add content to this file.

To remove the immutable attribute from a file you need to use the chattr command again. For example:

root@server:~# chattr -i example.txt
root@server:~# lsattr example.txt
-----------------e- example.txt

Attribute “a“

Another useful file attribute is the “a” attribute. The “a” stands for “append” and this flag indicates that a file can only be opened for append operations, i.e. additional content can only be added to the file but none of the existing content can be modified.

The functionality can be easily illustrated with the example below:

First, set the “a” attribute:

root@server:~# chattr +a example.txt
root@server:~# lsattr example.txt
-----a-----------e- example.txt

Next, attempt to modify the file:

root@server:~# rm -f example.txt
rm: cannot remove `example.txt': Operation not permitted

root@server:~# mv example.txt renamed.txt
mv: cannot move `example.txt' to `renamed.txt': Operation not
permitted

root@server:~# echo "replacing content" > example.txt
bash: example.txt: Operation not permitted

root@server:~# echo "appending new content" >> example.txt

Only the last operation that we attempted on this file was successful because it just appended the “appending new content” string to the end of the file without modifying its existing content.