I've been studying all the relevant manuals and have successfully labelled my partition sdd1, which is not at present mounted. It doesn't appear in /etc/mtab, but is shown in /etc/fstab by the line:
LABEL=SATABkps /media/sdd1 ntfs-3g rw,uid=1000,nodev,relatime,blksize=4096 0 2.
(ntfs-config is installed).
Its presence in fstab has not resulted in it being mounted but it may not have been labelled when the PC booted this morning.
In response to the command $ ls /dev/disk/by-label lah the report includes the line:
lrwxrwxrwx 1 root root 10 2008-09-08 11:15 SATABkps -> ../../sdd1
which indicates an unknown path.
after running /$ updatedb, the command /$ locate -b /SATABkps produces no response.
Why? The partition appears in "Computer" when I open that in the desktop screen, with its new name, but it refuses to mount directly in spite of its permissions.
$ sudo mount -t ntfs-3g /dev/sdd1 and $ sudo mount -t ntfs-3g /SATABkps also fail.
I shall be most grateful for advice.