#StackBounty: #18.04 #synaptic #pkexec #deadlock pkexec hanging in gnome 3.28 & xorg, takes forever to proceed, how to fix it?

Bounty: 100

After the OS is running for a while, it may trigger for a bug that caused pkexec (including any application that use it, including synaptic) to hang. This can only be recovered from relaunching OS or gnome-shell.

This is a screenshot that describe this situation:

xhost +si:localuser:root
pkexec synaptic

enter image description here

I remember the same error in Manjaro with gnome 3.28, it disappeared in gnome 3.30. How do I backport the fix (if there is any) to Ubuntu 18.04?

UPDATE 1

these are my desktop environment:

$ export | grep XDG_SESS
declare -x XDG_SESSION_DESKTOP="ubuntu"
declare -x XDG_SESSION_ID="1"
declare -x XDG_SESSION_TYPE="x11"

… and synaptics version

$ apt-cache policy synaptic
synaptic:
  Installed: 0.84.3ubuntu1
  Candidate: 0.84.3ubuntu1
  Version table:
 *** 0.84.3ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status
peng@peng-ThinkPad-P51s:~$ 


Get this bounty!!!

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