> If I have write permissions on a folder, shouldn't I be able to create and 
> delete
> files on it?

You can create and delete files but you can't update the timestamps as your
error message says. From the utimes manual:

     "Changing time stamps is permitted when: either the process has 
appropriate 
       privileges (Linux: has the CAP_FOWNER capability),  or  the  effective 
user ID 
       equals the user ID of the file, or buf must is NULL and the process has  
write 
       permission to the file."

You're trying to change the timestamp as you/ntfs user/group , so you're not 
entitled to do so. The check is done by the kernel and it's correct.

If you want to be able to change the timestamps then use the 'uid' mount
option.

>  Why should I be the same user of who mounts the ntfs partition?

Because nobody implemented full multi-user support with full access right
handling for NTFS yet. So either the above or full access for everybody are
the current choices at the moment.

-- 
Cannot utime: Operation not permitted
https://bugs.launchpad.net/bugs/124795
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