Impossible to remove a file in the file system. of Fedora 31

I have deleted everything in my Fedora file system to remove all traces of virtualbox. I try reinstalling virtualbox and it still says that virtualbox still exists.

The only trace I cannot remove is use_virtualbox which is in booleans

done everything I can think of to remove this file or rename it with root files and terminal.

even chmod 777 will not help.

See this in a root terminal
[root@windows12shop booleans]# rm use_virtualbox
rm: remove regular empty file 'use_virtualbox'? yes
rm: cannot remove 'use_virtualbox': Operation not permitted
[root@windows12shop booleans]# chmod 777 use_virtualbox
[root@windows12shop booleans]# rm use_virtualbox
rm: remove regular empty file 'use_virtualbox'? y
rm: cannot remove 'use_virtualbox': Operation not permitted
[root@windows12shop booleans]#

Anyone know how to remove this?

A mystery to me.