Hello,           I am trying to delete a "doc" folder on my computer but have been unable to do so.How do I delete it? Some output below should give an indication of what I have tried. peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ ls -l ls: cannot access 'doc': Permission denied total 236 drw------- 2 root  root    4096 Jan 17 23:32 dconf d????????? ? ?     ?          ?            ? doc drw-r--r-- 3 peter peter   4096 Dec 31 18:53 flatpak drw-r--r-- 2 peter peter  12288 Jan  2 10:53 fontconfig drw-rw-r-- 2 peter peter   4096 Jan  8 21:23 gstreamer-1.0 drw------- 3 peter peter   4096 Dec 31 18:53 mate drw-rw-r-- 3 peter peter   4096 Jan  1 21:25 matplotlib drw-r--r-- 7 peter peter   4096 Jan 17 16:59 mesa_shader_cache drw-rw-r-- 3 peter peter   4096 Dec 31 20:02 mintinstall drw------- 2 peter peter   4096 Dec 31 18:53 obexd drw------- 4 peter peter   4096 Jan  1 00:33 pip -rw-rw-r-- 1 peter peter 165196 Jan  3 08:52 qt_compose_cache_little_endian_fede3597f8724a62b7726a319d60a6bc drw-r--r-- 2 peter peter   4096 Jan  2 22:08 qtshadercache drw------- 3 peter peter   4096 Dec 31 18:54 thumbnails drwx------ 3 peter peter   4096 Dec 31 20:08 thunderbird drwxrwxr-x 2 peter peter   4096 Dec 31 20:12 wine drwx------ 3 peter peter   4096 Jan  2 00:40 xreader drwx------ 3 peter peter   4096 Jan  7 22:09 yelp peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo ls -l total 236 drw------- 2 root  root    4096 Jan 17 23:32 dconf dr-x------ 2 root  root       0 Jan  1  1970 doc drw-r--r-- 3 peter peter   4096 Dec 31 18:53 flatpak drw-r--r-- 2 peter peter  12288 Jan  2 10:53 fontconfig drw-rw-r-- 2 peter peter   4096 Jan  8 21:23 gstreamer-1.0 drw------- 3 peter peter   4096 Dec 31 18:53 mate drw-rw-r-- 3 peter peter   4096 Jan  1 21:25 matplotlib drw-r--r-- 7 peter peter   4096 Jan 17 16:59 mesa_shader_cache drw-rw-r-- 3 peter peter   4096 Dec 31 20:02 mintinstall drw------- 2 peter peter   4096 Dec 31 18:53 obexd drw------- 4 peter peter   4096 Jan  1 00:33 pip -rw-rw-r-- 1 peter peter 165196 Jan  3 08:52 qt_compose_cache_little_endian_fede3597f8724a62b7726a319d60a6bc drw-r--r-- 2 peter peter   4096 Jan  2 22:08 qtshadercache drw------- 3 peter peter   4096 Dec 31 18:54 thumbnails drwx------ 3 peter peter   4096 Dec 31 20:08 thunderbird drwxrwxr-x 2 peter peter   4096 Dec 31 20:12 wine drwx------ 3 peter peter   4096 Jan  2 00:40 xreader drwx------ 3 peter peter   4096 Jan  7 22:09 yelp peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo ls -l doc total 0 dr-x------ 2 root root 0 Jan  1  1970 by-app peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo ls -l doc/by-app total 0 peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo rm doc rm: cannot remove 'doc': Is a directory peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo rm -r doc rm: cannot remove 'doc/by-app': Function not implemented peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo rmdir doc rmdir: failed to remove 'doc': Device or resource busy peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ lsof -N lsof: WARNING: can't stat() fuse file system /home/peter/.cache/doc       Output information may be incomplete. peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo rmdir -p doc [sudo] password for peter: rmdir: failed to remove 'doc': Device or resource busy peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ man rmdir peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$ sudo rmdir -p doc/by-app rmdir: failed to remove 'doc/by-app': Function not implemented peter@FLYQB8M9RETO9JA05LY0A3QPQB6OXGXZ0QOC0QN9:~/.cache$