No systemtrayicon available

[Fabrizio Rovedi]

HP Linux Imaging and Printing System (ver. 3.19.12)
System Tray Status Service ver. 2.0

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:127: RuntimeWarning: PyOS_InputHook is not available for interactive use of PyGTK
  set_interactive(1)
No systemtrayicon available

fabrizio@fabrizio-1TB:~$ lsb_release -rd
Description: Ubuntu 18.04.3 LTS
Release: 18.04
fabrizio@fabrizio-1TB:~$ apt-cache policy hplip
hplip:
  Installato: 3.17.10+repack0-5
  Candidato: 3.17.10+repack0-5
  Tabella versione:
 *** 3.17.10+repack0-5 500
        500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

Thank you for your bug report. What desktop environment and session do you use?

Could you add your 'journalctl -b 0' log after triggering the issue?

[Fabrizio Rovedi (linux.user)]

fabrizio@fabrizio-1TB:~$ env | grep DESKTOP_SESSION=
DESKTOP_SESSION=ubuntu
fabrizio@fabrizio-1TB:~$ ps -A | egrep -i "gnome|kde|mate|cinnamon"
   57 ? 00:00:00 kdevtmpfs
 5319 tty2 01:13:01 gnome-shell
 5478 ? 00:00:01 gnome-keyring-d
 5536 tty2 00:00:00 gnome-session-b
 5703 ? 00:00:00 gnome-shell-cal
 6994 tty2 00:00:56 gnome-software
12716 ? 00:00:28 gnome-terminal-

[Fabrizio Rovedi (linux.user)]

fabrizio@fabrizio-1TB:~$ journalctl -b 0 | tail -100
mar 26 12:34:57 fabrizio-1TB gnome-shell[28379]: Failed to load file:///usr/share/gnome-shell/extensions/ubuntu-close-window.svg: Errore nell'aprire il file /usr/share/gnome-shell/extensions/ubuntu-close-window.svg: File o directory non esistente
mar 26 12:34:57 fabrizio-1TB gnome-shell[28379]: Failed to load file:///usr/share/gnome-shell/extensions/ubuntu-close-window.svg: Errore nell'aprire il file /usr/share/gnome-shell/extensions/ubuntu-close-window.svg: File o directory non esistente
mar 26 12:34:57 fabrizio-1TB gnome-shell[28379]: Failed to load file:///usr/share/gnome-shell/extensions/ubuntu-close-window.svg: Errore nell'aprire il file /usr/share/gnome-shell/extensions/ubuntu-close-window.svg: File o directory non esistente
mar 26 12:34:57 fabrizio-1TB gnome-shell[28379]: Failed to load file:///usr/share/gnome-shell/extensions/ubuntu-close-window.svg: Errore nell'aprire il file /usr/share/gnome-shell/extensions/ubuntu-close-window.svg: File o directory non esistente
mar 26 12:34:57 fabrizio-1TB gnome-shell[28379]: Failed to load file:///usr/share/gnome-shell/extensions/ubuntu-close-window.svg: Errore nell'aprire il file /usr/share/gnome-shell/extensions/ubuntu-close-window.svg: File o directory non esistente
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: Failed to load file:///usr/share/gnome-shell/extensions/ubuntu-close-window.svg: Errore nell'aprire il file /usr/share/gnome-shell/extensions/ubuntu-close-window.svg: File o directory non esistente
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: Failed to load file:///usr/share/gnome-shell/extensions/ubuntu-close-window.svg: Errore nell'aprire il file /usr/share/gnome-shell/extensions/ubuntu-close-window.svg: File o directory non esistente
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: g_file_get_parent: assertion 'G_IS_FILE (file)' failed
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: g_file_resolve_relative_path: assertion 'G_IS_FILE (file)' failed
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: g_file_get_parent: assertion 'G_IS_FILE (file)' failed
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: g_file_resolve_relative_path: assertion 'G_IS_FILE (file)' failed
mar 26 12:34:58 fabrizio-1TB gnome-shell[28379]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
mar 26 12:35:22 fabrizio-1TB nautilus[5926]: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
mar 26 12:35:22 fabrizio-1TB nautilus[5926]: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
mar 26 12:35:22 fabrizio-1TB nautilus[5926]: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
mar 26 12:35:22 fabrizio-1TB nautilus[5926]: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
mar 26 12:35:26 fabrizio-1TB nautilus[5926]: gtk_label_set_markup: assertion 'GTK_IS_LABEL (label)' failed
mar 26 12:35:26 fabrizio-1TB nautilus[5926]: gtk_revealer_set_reveal_child: assertion 'GTK_IS_REVEALER (revealer)' failed
mar 26 12:35:26 fabrizio-1TB nautilus[5926]: gtk_labe...

[Sebastien Bacher (seb128)]

Could you include the output of that command?

$ gsettings get org.gnome.shell enabled-extensions

[andreyvk (digicraft)]

I have the same issue.
Output is

$gsettings get org.gnome.shell enabled-extensions
['<email address hidden>', '<email address hidden>']

[andreyvk (digicraft)]

journalctl output is:

Jul 30 15:01:10 a17u gnome-shell[1421]: _st_paint_shadow_with_opacity: assertion 'shadow_pipeline != NULL' failed
Jul 30 15:01:10 a17u gnome-shell[1421]: _st_paint_shadow_with_opacity: assertion 'shadow_pipeline != NULL' failed
Jul 30 15:02:55 a17u hp-setup[24320]: hp-setup[24320]: warning: One or more print queues already exist for this device: HP_LaserJet_Pro_M148-M149.
Jul 30 15:03:17 a17u audit[24421]: AVC apparmor="DENIED" operation="file_lock" profile="/usr/share/hplip/systray.py" name="/etc/xdg/Trolltech.conf" pid=24421 comm="python" requested_mask="k" denied_mask="k" fsui
Jul 30 15:03:17 a17u kernel: audit: type=1400 audit(1596135797.670:50): apparmor="DENIED" operation="file_lock" profile="/usr/share/hplip/systray.py" name="/etc/xdg/Trolltech.conf" pid=24421 comm="python" reques
Jul 30 15:04:00 a17u simple-scan[26024]: common/utils.c 245: unable to load library libm.so: /usr/lib/x86_64-linux-gnu/libm.so: invalid ELF header
Jul 30 15:04:00 a17u simple-scan[26024]: common/utils.c 69: unable to open /var/lib/hp/hplip.state: No such file or directory
Jul 30 15:04:00 a17u simple-scan[26024]: common/utils.c 119: validate_plugin_version() Failed to get Plugin version from [/var/lib/hp/hplip.state]
Jul 30 15:04:00 a17u simple-scan[26024]: common/utils.c 157: Plugin version is not matching
Jul 30 15:04:00 a17u simple-scan[26024]: common/utils.c 220: Invalid Library hanlder pLibHandler = NULL.
Jul 30 15:04:00 a17u audit[24496]: AVC apparmor="DENIED" operation="file_lock" profile="/usr/share/hplip/systray.py" name="/etc/xdg/Trolltech.conf" pid=24496 comm="python" requested_mask="k" denied_mask="k" fsui
Jul 30 15:04:00 a17u kernel: audit: type=1400 audit(1596135840.607:51): apparmor="DENIED" operation="file_lock" profile="/usr/share/hplip/systray.py" name="/etc/xdg/Trolltech.conf" pid=24496 comm="python" reques
Jul 30 15:04:00 a17u org.gnome.Shell.desktop[3723]: Window manager warning: Invalid WM_TRANSIENT_FOR window 0x6c00006 specified for 0x6c00004 (HP Device ).
Jul 30 15:04:03 a17u audit[24510]: AVC apparmor="DENIED" operation="file_mmap" profile="/usr/share/hplip/plugin.py" name="/usr/bin/env" pid=24510 comm="hp-plugin" requested_mask="m" denied_mask="m" fsuid=1000 ou
Jul 30 15:04:03 a17u hp-diagnose_plugin[24496]: hp-diagnose_plugin[24496]: error: Failed to install Plug-in.
                                                Either you have chosen to skip the Plug-in installation or entered incorrect Password.
Jul 30 15:04:03 a17u kernel: audit: type=1400 audit(1596135843.623:52): apparmor="DENIED" operation="file_mmap" profile="/usr/share/hplip/plugin.py" name="/usr/bin/env" pid=24510 comm="hp-plugin" requested_mask=
Jul 30 15:04:17 a17u hp-systray[24421]: hp-systray(qt4)[24421]: error: No system tray detected on this system. Unable to start, exiting.
Jul 30 15:04:19 a17u org.gnome.Shell.desktop[3723]: Window manager warning: Invalid WM_TRANSIENT_FOR window 0x7600005 specified for 0x7600003 (HPLIP Stat).
Jul 30 15:04:46 a17u org.gnome.Shell.desktop[3723]: [24650:1:0730/150446.747385:ERROR:child_thread_impl.cc(792)] Receiver for unknown Channel-associated interface: chrome.mojom.SearchBouncer
Jul 30 15:04:46 a17u org.g...