I can confirm that after rebuilding mtools with the patch in Comment #4 on a fully updated Precise machine I can now set device labels properly:
$ sudo mlabel -i /dev/sdb1 ::FWTS_LIVE $ sudo mlabel -s -i /dev/sdb1 :: Volume label is FWTS_LIVE nA
[ after a rebuild of mtools ]
$ sudo mlabel -s -i /dev/sdb1 :: Volume label is FWTS_LIVE nA $ sudo mlabel -i /dev/sdb1 ::FWTS_LIVE $sudo mlabel -s -i /dev/sdb1 :: Volume label is FWTS_LIVE
I can confirm that after rebuilding mtools with the patch in Comment #4 on a fully updated Precise machine I can now set device labels properly:
$ sudo mlabel -i /dev/sdb1 ::FWTS_LIVE
$ sudo mlabel -s -i /dev/sdb1 ::
Volume label is FWTS_LIVE nA
[ after a rebuild of mtools ]
$ sudo mlabel -s -i /dev/sdb1 ::
Volume label is FWTS_LIVE nA
$ sudo mlabel -i /dev/sdb1 ::FWTS_LIVE
$sudo mlabel -s -i /dev/sdb1 ::
Volume label is FWTS_LIVE