Mount cifs Network Drive: write permissions and chown

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http://unix.stackexchange.com – I have access to a cifs network drive. When I mount it under my OSX machine, I can read and write from and to it. When I mount the drive in ubuntu, using: sudo mount -t cifs -o username=${USER},password=${PASSWORD} //server-address/folder /mount/path/on/ubuntu I am not able to write to the network drive, but I can read from it. I have checked the permissions and owner of the mount folder, they look like: 4.0K drwxr-xr-x 4 root root 0 Nov 12 2010 Mounted_folder I cannot change the owner, because I get the error: chown: changing ownership of `/Volumes/Mounted_folder': Not a (HowTos)