CDs are not mounted in file managers

[Konstantin Pelepelin]

In a fresh LUbuntu Desktop 18.04 installation in VirtualBox 6.0, in both pcmanfm and nautilus I get the same error message when trying to insert a CD:

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Error mounting /dev/sr0 at /media/user/VBox_GAs_6.0.18: wrong fs type, bad option, bad superblock on /dev/sr0, missing codepage or helper program, or other error
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The inserted CDs can be perfectly mounted by root into other empty directory and read by normal mount command without any additional work.

Suggested directory does not exist. If I created it manually as root, the other name was suggested.

$ ls -ld /media/user
drwxr-x---+ 2 root root 4096 Mar 2 01:55 /media/user

$ ps aux| grep gv
user 1152 0.0 0.3 286084 6944 ? Ssl 00:52 0:00 /usr/lib/gvfs/gvfsd
user 1157 0.0 0.2 416112 5332 ? Sl 00:52 0:00 /usr/lib/gvfs/gvfsd-fuse /run/user/1000/gvfs -f -o big_writes
user 1321 0.0 0.4 300560 8420 ? Ssl 00:52 0:00 /usr/lib/gvfs/gvfs-udisks2-volume-monitor
user 1325 0.0 0.3 372936 7656 ? Ssl 00:52 0:00 /usr/lib/gvfs/gvfs-afc-volume-monitor
user 1330 0.0 0.2 268160 5852 ? Ssl 00:52 0:00 /usr/lib/gvfs/gvfs-goa-volume-monitor
user 1334 0.0 0.2 269984 4792 ? Ssl 00:52 0:00 /usr/lib/gvfs/gvfs-mtp-volume-monitor
user 1338 0.0 0.2 282772 5696 ? Ssl 00:52 0:00 /usr/lib/gvfs/gvfs-gphoto2-volume-monitor
user 1350 0.0 0.3 362220 7064 ? Sl 00:52 0:00 /usr/lib/gvfs/gvfsd-trash --spawner :1.5 /org/gtk/gvfs/exec_spaw/0

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gvfs 1.36.1-0ubuntu1.3.3
ProcVersionSignature: Ubuntu 5.3.0-40.32~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-40-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.11
Architecture: amd64
CurrentDesktop: LXDE
Date: Mon Mar 2 01:44:21 2020
SourcePackage: gvfs
UpgradeStatus: No upgrade log present (probably fresh install)