Public bug reported:
$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Short story:
When a partition has both a partition label and a filesystem label, and is
identified in /etc/fstab by PARTLABEL= , both file manager's side pane (thunar
on Xubuntu) and the desktop (with the setting 'icons/default icons/Removable
Devices/Disk and Drives') show two shortcuts for the partition: one for the
/etc/fstab entry, named as the last pathname component of the mount point in
/etc/fstab, and a self-generated second shortcut, named after the filesystem
label. By some seemingly random process either of both shortcuts is mounted at
some point, preventing the other one to be mounted, EVEN when that one is
marked as automount in /etc/fstab. If the mounted shortcut is /etc/fstab's
PARTLABEL= entry, it is mounted to the provided /etc/fstab mount point. If the
mounted shortcut is that for the filesystem label, it is mounted to a temporary
directory under /media/myusername/. In either case, the other shortcut can't be
mounted then.
This behaviour makes it unpredictable through which path a partition can
be reached. The problem is not present for partitions without a
filesystem label, even if they are identified in /etc/fstab by
PARTLABEL= .
As a workaround I reverted back to identifying the partitions in
/etc/fstab by UUID=, which if I am right, is a filesystem feature.
I read somewhere that the option to identify partitions by PARTLABEL=
and PARTUUID= is a more recent addition to fstab-syntax, so my first
guess is that the auto-mounting system isn't yet aware of these; it
seems to collect and identify partitions by features (uuid or label) of
the filesystems on them, and when comparing that to the /etc/fstab
entries, it does not recognize them as being the same partition
identified in /etc/fstab by it's features from the partition table.
Long story:
After using and learning linux (Xubuntu) for half a year, I decided to do the
right thing and stop identifying partitions to be mounted by block special
device node (/dev/sda1 to /dev/sdb4 for my setup), but by a persistent name. So
I set out to change /etc/fstab to identify the partitions to mount by UUID=,
and that went well and I felt safe. Only problem was that a week later, I had
no clue which UUID is which partition, which made me uncomfortably uncertain.
So I used 'parted' to name all my partitions with a meaningfull
partition label (similar but not identical to the filesystem label that
I had named them to with 'e2label', 'fatlabel' and 'ntfslabel'). I also
changed /etc/fstab to reflect that, now identifying my partitions using
the PARTLABEL= . I choose PARTLABEL= instead of LABEL=, because it
requires more skill and privileges to change a partition label than to
change a filesystem label.
>From then on, the automatic mounting behaviour became erratic. The
desktop and the side pane of the file manager now showed 2 shortcuts for
each partition: one named like the filesystem label, another named like
the last path component of the mount point in /etc/fstab. When mounting
the partition is triggered,by clicking one of both shortcuts in on
desktop or in filemanager, or by some other process, and even with
automount in /etc/fstab, one of the shortcuts is used for mounting the
partition, preventing the other one to be mounted as well later.
By this behaviour the same partition could be accessed at either but not
both mount points. Either the mount point provided in /etc/fstab/, which
is accessible in file manager under an entry named after the last path
component of that mount point, which is linked to the full mount path.
Either a temporary mount point which 'the system' creates in my user's
/media/myusername/ directory, which is accessible in file manager under
the name of the filesystem label, which again is linked to the full
mount path.
Because I find it a bit creepy to edit /etc/fstab, I did not go on to
try identifying the partitions by LABEL= or by PARTUUID= . My guess is
that PARTUUID= would exhibit the same problem, and LABEL= not.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: udisks2 2.1.7-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
Uname: Linux 4.4.0-53-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.2
Architecture: amd64
CurrentDesktop: XFCE
CustomUdevRuleFiles: 56-hpmud.rules 60-vboxdrv.rules
Date: Mon Dec 12 17:35:41 2016
InstallationDate: Installed on 2016-04-07 (249 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: MSI MS-7971
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-53-generic.efi.signed
root=UUID=88e332dc-deb9-4c9c-9dfc-e0afe7ad45bd ro quiet splash vt.handoff=7
SourcePackage: udisks2
Symptom: storage
Title: Internal hard disk partition cannot be mounted manually
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/25/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: B.50
dmi.board.asset.tag: Default string
dmi.board.name: H170A PC MATE (MS-7971)
dmi.board.vendor: MSI
dmi.board.version: 2.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 2.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrB.50:bd01/25/2016:svnMSI:pnMS-7971:pvr2.0:rvnMSI:rnH170APCMATE(MS-7971):rvr2.0:cvnMSI:ct3:cvr2.0:
dmi.product.name: MS-7971
dmi.product.version: 2.0
dmi.sys.vendor: MSI
** Affects: udisks2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug partlabel xenial
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https://bugs.launchpad.net/bugs/1649360
Title:
identifying a partitition in fstab by PARTLABEL creates a second entry
for the partition, for it's file system label
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