Nautilus/Files UI requires sudo access to unmount a disk that can be unmounted successfully without sudo using command line

[Sergey Ushakov]

An external disk device is declared in '/etc/fstab' with 'auto,nofail,users' options:
UUID=aa083302-...-b66c0715eaf1 /media/ushakov/TOSHIBA_SYSTEM ext4 nodev,nosuid,auto,nofail,users 0 2

It is then successfully mounted automatically upon being connected.

It can further be unmounted successfully without `sudo` from command line, e.g.: `umount $mount_point`.

Meanwhile an attempt to unmount this device from Nautilus/Files UI results in an "Authentication Required" message: "Authentication is required to unmount External USB3.0 (/dev/sdc3) mounted by another user".

The expected Nautilus/Files UI behavior would be that the disk device is unmounted silently or just with an non-intrusive notification upon a click on the "Unmount" button near the device label.

Package suspected: nautilus:
nautilus/bionic-updates,now 1:3.26.4-0~ubuntu18.04.4 amd64 [installed,automatic]

$ lsb_release -rd
Description: Ubuntu 18.04.3 LTS
Release: 18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: nautilus 1:3.26.4-0~ubuntu18.04.4
ProcVersionSignature: Ubuntu 5.0.0-35.38~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-35-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Nov 16 09:50:54 2019
GsettingsChanges:
 b'org.gnome.nautilus.preferences' b'default-folder-viewer' b"'list-view'"
 b'org.gnome.nautilus.window-state' b'sidebar-width' b'394'
 b'org.gnome.nautilus.window-state' b'geometry' b"'1279x749+193+153'"
 b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'owner', 'group', 'permissions', 'mime_type', 'where', 'date_modified', 'date_modified_with_time', 'date_accessed', 'recency']"
InstallationDate: Installed on 2019-10-15 (32 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)
usr_lib_nautilus:

[Sebastien Bacher (seb128)]

Thank you for your bug report. That looks like an upstream issue, could you report it there https://gitlab.gnome.org/GNOME/nautilus ?

[Sergey Ushakov (s-n-ushakov)]

Thank you Sebatien for looking into that.

The GNOME bug is filed as https://gitlab.gnome.org/GNOME/nautilus/issues/1293 .

[Sergey Ushakov (s-n-ushakov)]

Update: the issue at GNOME repository was re-classified from nautilus-related to glib-related: https://gitlab.gnome.org/GNOME/glib/issues/1942 .

[Sebastien Bacher (seb128)]

Thanks

[Sergey Ushakov (s-n-ushakov)]

Update: the issue at GNOME repository was closed ( https://gitlab.gnome.org/GNOME/glib/issues/1942#note_651026 ), and a new issue was filed for the `udisks` repository: https://github.com/storaged-project/udisks/issues/709 , with probable bug location at or near https://github.com/storaged-project/udisks/blob/master/src/udiskslinuxfilesystem.c#L1946 , as suggested at https://gitlab.gnome.org/GNOME/glib/issues/1942#note_651025 .

[Sebastien Bacher (seb128)]

Thanks, reassigning

[Sebastien Bacher (seb128)]

Udisk upstream fixed it in this commit
https://github.com/storaged-project/udisks/pull/710

Thanks again for upstream the problem and helping driving it to resolution! It should we fixed in the new udisk update (and then maybe we can consider doing a SRU to the LTS)