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.gnome.Shell.desktop[3723]: 
[24651:1:0730/150446.761580:ERROR:child_thread_impl.cc(792)] Receiver for 
unknown Channel-associated interface: chrome.mojom.SearchBouncer
Jul 30 15:04:55 a17u org.gnome.Shell.desktop[3723]: 
[24710:1:0730/150455.174079:ERROR:child_thread_impl.cc(792)] Receiver for 
unknown Channel-associated interface: chrome.mojom.SearchBouncer

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