I have the same issue.

I have Virtualbox running as well.
I'm not switching between users. Just standby and resume.


Here are some parts of several logfiles.

auth.log
======================================
Mar 12 16:36:33 BN pkexec: pam_systemd(polkit-1:session): Cannot create 
session: Already running in a session
Mar 12 16:36:33 BN pkexec[20336]: bart: Executing command [USER=root] 
[TTY=unknown] [CWD=/home/bart] 
[COMMAND=/usr/lib/unity-settings-daemon/usd-backlight-helper --set-brightness 
7126]
Mar 12 16:36:45 BN lightdm: PAM unable to dlopen(pam_kwallet.so): 
/lib/security/pam_kwallet.so: cannot open shared object file: No such file or 
directory
Mar 12 16:36:45 BN lightdm: PAM adding faulty module: pam_kwallet.so
Mar 12 16:36:45 BN lightdm: PAM unable to dlopen(pam_kwallet5.so): 
/lib/security/pam_kwallet5.so: cannot open shared object file: No such file or 
directory
Mar 12 16:36:45 BN lightdm: PAM adding faulty module: pam_kwallet5.so
Mar 12 16:36:45 BN lightdm: pam_unix(lightdm-greeter:session): session opened 
for user lightdm by (uid=0)
Mar 12 16:36:45 BN systemd-logind[1178]: New session c32 of user lightdm.
Mar 12 16:36:45 BN lightdm: PAM unable to dlopen(pam_kwallet.so): 
/lib/security/pam_kwallet.so: cannot open shared object file: No such file or 
directory
Mar 12 16:36:45 BN lightdm: PAM adding faulty module: pam_kwallet.so
Mar 12 16:36:45 BN lightdm: PAM unable to dlopen(pam_kwallet5.so): 
/lib/security/pam_kwallet5.so: cannot open shared object file: No such file or 
directory
Mar 12 16:36:45 BN lightdm: PAM adding faulty module: pam_kwallet5.so
Mar 12 16:36:45 BN lightdm: pam_succeed_if(lightdm:auth): requirement "user 
ingroup nopasswdlogin" not met by user "bart"
Mar 12 16:36:49 BN lightdm: pam_unix(lightdm-greeter:session): session closed 
for user lightdm
Mar 12 16:36:49 BN dbus[1153]: [system] Rejected send message, 2 matched rules; 
type="method_call", sender=":1.498" (uid=109 pid=20527 
comm="/usr/lib/x86_64-linux-gnu/indicator-bluetooth/indi") 
interface="org.freedesktop.DBus.Properties" member="GetAll" error 
name="(unset)" requested_reply="0" destination=":1.380" (uid=0 pid=10380 
comm="/usr/lib/bluetooth/bluetoothd ")
Mar 12 16:36:49 BN dbus[1153]: [system] Rejected send message, 2 matched rules; 
type="method_call", sender=":1.498" (uid=109 pid=20527 
comm="/usr/lib/x86_64-linux-gnu/indicator-bluetooth/indi") 
interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" error 
name="(unset)" requested_reply="0" destination="org.bluez" (uid=0 pid=10380 
comm="/usr/lib/bluetooth/bluetoothd ")
Mar 12 16:37:15 BN sudo:     bart : TTY=pts/22 ; PWD=/home/bart ; USER=root ; 
COMMAND=/usr/bin/zsh
Mar 12 16:37:15 BN sudo: pam_unix(sudo:session): session opened for user root 
by (uid=0)
Mar 12 16:38:58 BN pkexec: pam_unix(polkit-1:session): session opened for user 
root by (uid=1000)
Mar 12 16:38:58 BN pkexec: pam_systemd(polkit-1:session): Cannot create 
session: Already running in a session
Mar 12 16:38:58 BN pkexec[22237]: bart: Executing command [USER=root] 
[TTY=unknown] [CWD=/home/bart] 
[COMMAND=/usr/lib/update-notifier/package-system-locked]


Xorg.0.log
======================================
[ 23362.625] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 23364.120] (--) synaptics: DLL075B:01 06CB:76AF Touchpad: touchpad found
[ 23368.192] (II) AIGLX: Resuming AIGLX clients after VT switch
[ 23369.699] (II) Quirked EDID physical size to 0x0 cm
[ 23369.699] (II) modeset(0): EDID vendor "SAM", prod id 1485
[ 23369.699] (II) modeset(0): Using hsync ranges from config file
[ 23369.699] (II) modeset(0): Using vrefresh ranges from config file
[ 23369.699] (II) modeset(0): Printing DDC gathered Modelines:
[ 23369.699] (II) modeset(0): Modeline "1920x1080"x0.0  148.50  1920 2008 2052 
2200  1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 23369.699] (II) modeset(0): Modeline "1280x720"x0.0   74.25  1280 1390 1430 
1650  720 725 730 750 +hsync +vsync (45.0 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1920x1080i"x0.0   74.25  1920 2448 2492 
2640  1080 1084 1094 1125 interlace +hsync +vsync (28.1 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1920x1080i"x0.0   74.25  1920 2008 2052 
2200  1080 1084 1094 1125 interlace +hsync +vsync (33.8 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1280x720"x0.0   74.25  1280 1720 1760 
1980  720 725 730 750 +hsync +vsync (37.5 kHz e)
[ 23369.699] (II) modeset(0): Modeline "720x576"x0.0   27.00  720 732 796 864  
576 581 586 625 -hsync -vsync (31.2 kHz e)
[ 23369.699] (II) modeset(0): Modeline "720x480"x0.0   27.00  720 736 798 858  
480 489 495 525 -hsync -vsync (31.5 kHz e)
[ 23369.699] (II) modeset(0): Modeline "800x600"x0.0   40.00  800 840 968 1056  
600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 23369.699] (II) modeset(0): Modeline "800x600"x0.0   36.00  800 824 896 1024  
600 601 603 625 +hsync +vsync (35.2 kHz e)
[ 23369.699] (II) modeset(0): Modeline "640x480"x0.0   25.18  640 656 752 800  
480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1024x768"x0.0   65.00  1024 1048 1184 
1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1600x1200"x0.0  162.00  1600 1664 1856 
2160  1200 1201 1204 1250 +hsync +vsync (75.0 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 
1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1280x960"x0.0  108.00  1280 1376 1488 
1800  960 961 964 1000 +hsync +vsync (60.0 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1280x800"x0.0   71.00  1280 1328 1360 
1440  800 803 809 823 +hsync -vsync (49.3 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1440x900"x0.0   88.75  1440 1488 1520 
1600  900 903 909 926 +hsync -vsync (55.5 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1680x1050"x0.0  119.00  1680 1728 1760 
1840  1050 1053 1059 1080 +hsync -vsync (64.7 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1920x1080"x0.0   74.25  1920 2558 2602 
2750  1080 1084 1089 1125 +hsync +vsync (27.0 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1440x480i"x0.0   27.00  1440 1478 1602 
1716  480 488 494 525 interlace -hsync -vsync (15.7 kHz e)
[ 23369.699] (II) modeset(0): Modeline "1440x576i"x0.0   27.00  1440 1464 1590 
1728  576 580 586 625 interlace -hsync -vsync (15.6 kHz e)
[ 23369.734] [dix] couldn't enable device 14


I hope this helps.

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Title:
  Login screen showing Authentication Failure Switch to greeter...

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