Hi,
I'm on Linux Mint Tricia 19.3, Nemo 4.4.3. samsung J3 phone.
Worked good for me following Jeff suggestion (post #36). Install libmtp 1.1.16. 
Before, Nemo would take forever building dir of DCIM (if even returning), now 
it is ok. I can transfer files, delete, whatever, NO root needed. I confirm 
that : USB debuging have NOTHING to do with speed or access. Works, either way. 
Phone is almost as fast as a USB key(little slow with huge folders > 500 
entries)
Thanks to all, it was so frustrating. I noticed that sometimes there is a 
"ghost" entry in
/run/user/1000/gvfs$ ls
'mtp:host=%5Busb%3A003%2C015%5D' >>That is a correct entry.

BUT:
-One have to unlock phone screen BEFORE connecting to PC.

These are the console commands that worked for installing 1.1.16: (I
haven't try 1.1.17...)

   sudo apt install build-essential pkg-config wget libusb-1.0-0-dev
libusb-dev

    wget 
http://downloads.sourceforge.net/project/libmtp/libmtp/1.1.16/libmtp-1.1.16.tar.gz
    tar xzf libmtp-1.1.16.tar.gz

    cd libmtp-1.1.16

    ./configure
    make
    sudo make install

Before I reinstall mtp-tools (1.1.13-1), maybe have something to do ?

Best regards,
Robert

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gvfs in Ubuntu.
https://bugs.launchpad.net/bugs/1792085

Title:
  Regression: MTP not working/very slow

Status in libmtp:
  New
Status in gvfs package in Ubuntu:
  Incomplete

Bug description:
  Hi, unfortunately (for me) MTP android devices no more work on Ubuntu
  18.04.

  I have used MTP on 16.04 without problems, but on 18.04 it does not
  work. When I connect my Android devices (Samsung A5 and Samsung J3)
  and I try to list directories with many files (e.g. /DCIM/Camera) the
  window hangs until I disconnect the device. Same issue if I try to
  post the command "ls /var/run/1000/gvfs/<MTP-FOLDER>".

  I have installed Ubuntu 18.04 on two different machines - an older HP
  laptop and a recent DELL laptop - and the issue is present on the all
  of them.

  I suspect a defect on the "libmtp". I tried many alternative solutions
  suggested by the net (e.g. jmtpfs and so on) but anyone worked.

  That's all!

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gvfs-fuse 1.36.1-0ubuntu1.1
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CasperVersion: 1.394
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Sep 12 06:20:07 2018
  LiveMediaBuild: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gvfs
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/libmtp/+bug/1792085/+subscriptions

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