When using the same partition (NTFS) for syncing your Dropbox account in Windows and Linux you could found a cannot sync your files or write problem or even permission denied to write the files.

One workaround for this is to change the mounting options in /etc/fstab

/dev/ /media/ ntfs-3g defaults,uid=1000,gid=1000,utf8,umask=0022,rw 0 0


chmod 666 /dev/null
mount -o remount,rw /