In ubuntu 18.04,when I unplug the screen cable, the user session close's

[مالك ب]

Hello.
If I unplug the cable of the screen when I am logged to my user session in ubuntu 18.04, and then I plug again the cable of the screen, I found my session closed, and when I login again to my user session, I found all previous running programs closed.
This bug reproduce every time I unplug the cable screen from the unit.
what I expect: when I plug the screen cable to the unit, I must find my session open as I let it, and programs that were running still open or running
What happened: after I plug the cable screen to the unit, i find my session and all programs closed, and when I login again to my account session, I find all previous programs closed.
Distro: Ubuntu Bionic Beaver (development branch)
CPU: Intel® Pentium(R) CPU G645 @ 2.90GHz × 2
Graphic: Intel® Sandybridge Desktop
Gnome: 3.28.1
OS type: 64 bit
If there is any other information needed to help solving this bug that i must submit, just let me know it.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1765160/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[مالك ب (malikbemail-cybermouloud)]

I include the /var/crash/_usr_lib_x86_64-linux-gnu_libexec_kdeconnectd.1000.crash

After this first reply from Foundation Team Bug Bot, I follow the step described in
https://wiki.ubuntu.com/Bugs/FindRightPackage
The following description match this bug:
"If you have any of the following symptoms, the issue is with X and the package to report against is xorg: (See X/Troubleshooting if you want to pin-point the problem.)

    The graphical session terminates and returns to the login screen"

In the next post, I will follow other step described X/Troubleshooting page at
https://wiki.ubuntu.com/X/Troubleshooting

[مالك ب (malikbemail-cybermouloud)]

The next step i have done is, after installing xdiagnose, I run the following command in konsole:
ubuntu-bug xorg
and in the generated rapport, I click on submit, it take me to new page bugs.launchpad.net
and with more attached files:
and it create this new page:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1765479
I have mentioned this page on that new link, but now, I have one more question, were I must continue to signal this bug ? Is it at the new:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1765479
Or in this first page (https://bugs.launchpad.net/ubuntu/+bug/1765160),
or It will be merged automatically.
Thanks for helping

[مالك ب (malikbemail-cybermouloud)]

Hello
Today when I have removed the screen cable from the main unit and plug it again after few moments, the session did not closes and all running programs stay running. I did it again another time, the same thing happened: all the programs stayed running. It seems that the updates of theses few last days solved the problem.
Thanks for all ubuntu developers for the great job they are doing.