Automount in Ubuntu 9.10
Solution 1:
I found solution finally. Just add
gnome-mount -p Data(change it to your volume label)
to gnome startup applications. Now drive will be mounted at startup and you will be able to mount/unmount it without any errors.
Solution 2:
You could do this:
sudo aptitude update
sudo aptitude install ntfs-config
Open the program from System > Administration. Choose the drives that you want to be automounted. Click Apply. Make sure that "Enable Write Support for Internal Drives" and click OK.
Worked for me :)