Public bug reported:

Environment:

Distribution: Xubuntu 26.04 LTS
Device: Samsung Galaxy Tab S7+ (SM-T970)
USB vendor/product ID: 04e8:6860
libmtp: 1.1.22-1ubuntu1

Description:
------------

When connecting a Samsung Galaxy Tab S7+ via USB, the device initially
appears in Thunar's Devices sidebar. Clicking the device triggers an
authorization prompt on the tablet.

Immediately after selecting "Allow" on the tablet, the device disappears
from Thunar. As a result, browsing the tablet's filesystem is not
possible.

With previous versions of Ubuntu, the device would still be listed in
the devices section, and upon clicking on that device again, I would see
the contents of the tablet's filesystem.

Workaround:
-----------

Close Thunar, and open Thunar again. The samsung device has re-appeared,
and clicking on it shows the tablet's filesystem.

My theory:
----------

The authorization process results in the device's disconnection, and
reconnection, where the device ID ends up changing. Looking at the
`dmsg` output at the moment I press the "Allow" button on the tablet, we
can see the following logs:

<<
usb 3-5: USB disconnect, device number 11
usb 3-5: new high-speed USB device number 12 using xhci_hcd
usb 3-5: New USB device found, idVendor=04e8, idProduct=6860
>>

So the theory would be that Thunar loses track of the device because of
that ID change.

Other info:
-----------

I tried with both USB-2 and USB-3, no difference.

I found the following report that suggests other users might be facing
the issue? https://bbs.archlinux.org/viewtopic.php?id=309433

$ apt policy gvfs gvfs-backends thunar
gvfs:
  Installed: 1.60.0-1ubuntu0.1
  Candidate: 1.60.0-1ubuntu0.1
  Version table:
 *** 1.60.0-1ubuntu0.1 500
        500 http://ca.archive.ubuntu.com/ubuntu resolute-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu resolute-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     1.60.0-1 500
        500 http://ca.archive.ubuntu.com/ubuntu resolute/main amd64 Packages
gvfs-backends:
  Installed: 1.60.0-1ubuntu0.1
  Candidate: 1.60.0-1ubuntu0.1
  Version table:
 *** 1.60.0-1ubuntu0.1 500
        500 http://ca.archive.ubuntu.com/ubuntu resolute-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu resolute-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     1.60.0-1 500
        500 http://ca.archive.ubuntu.com/ubuntu resolute/main amd64 Packages
thunar:
  Installed: 4.20.7-1
  Candidate: 4.20.7-1
  Version table:
 *** 4.20.7-1 500
        500 http://ca.archive.ubuntu.com/ubuntu resolute/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: gvfs 1.60.0-1ubuntu0.1
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: XFCE
Date: Sun Oct 11 08:35:24 2026
InstallationDate: Installed on 2026-08-21 (51 days ago)
InstallationMedia: Xubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
SourcePackage: gvfs
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gvfs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug resolute

-- 
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2170498

Title:
  MTP Samsung tablet disappears from Thunar after USB authorization;
  restarting Thunar restores access

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