Proteger Folders em Linux

[zerozero]

JPedrosa, ROOKIE e Ricardo Ferreira obrigado pelo vosso tempo mas as dicas aqui nao funcionam.

Seguindo a ultima aqui postada, consigo mexer nas permissoes mas a cada alteracao o sistema reverte-a logo para o default. E depois de tentar as alteracoes sem sucesso, este e' o output que esta na consola

Código:

xxxxxxxx-laptop ~ $ sudo nautilus
[sudo] password for xxxxx:
Initializing nautilus-open-terminal extension
Initializing nautilus-image-converter extension

** (nautilus:7728): WARNING **: Unable to add monitor: Operação não suportada

--- Hash table keys for warning below:
--> file:///media
--> file:///root
--> file:///media/disk
--> file:///

(nautilus:7728): Eel-WARNING **: "nautilus-metafile.c: metafiles" hash table still has 4 elements at quit time (keys above)

(nautilus:7728): Eel-WARNING **: "nautilus-directory.c: directories" hash table still has 5 elements at quit time
Shutting down nautilus-image-converter extension
Shutting down nautilus-open-terminal extension
xxxxxxx-laptop ~ $