Ubuntu 20.04.3 desktop (Cinnamon) - SSH disconnects when user logs off the desktop!

[Randy Griggs]

On 1/24/22 5:15 AM, Bo Berglund wrote:
> On Sun, 23 Jan 2022 23:40:19 +0100, Bo Berglund <bo.berglund at gmail.com> wrote:
>
>> So tonight I made a final attempt at installing linuxmint-20.3-cinnamon-64bit
>> and it too is rebooting, in this case 11 minutes after I logged out from the
>> desktop to the login screen... :(
>>
>> I have now reached the next reboot so I can time the cycle: 673 s this time.
>> I will let it run like this for an hour or so and then inspect the log the
>> reporter creates to get a handle on the repeatability.
> It *was* repeating at approximately 670 s interval when staying on the login
> page!
>
>> Can I modify the startup somehow to make it automatically log me in to the
>> desktop when it boots? Then it would never stay on the login screen and the
>> reboots might not happen...
>> It is available during install, but can it be done later too?
> Yes, I found the way to make the system log me on to the GUI automatically on
> reboot:
> https://linuxhint.com/enable-auto-login-on-boot-linux-mint/
>
> With this in place I have rebooted and it did log me in to the desktop
> automatically.
>
> And it does *not* reboot anymore.
> So the system is running for many hours (overnight) without further reboots.
>
> I can thus use it in this way like I intended as a standalone system on a remote
> location which will mainly be accessed using SSH but occationally via VNC to the
> desktop.
>
> Of course VNC will use a different desktop since it is virtual.
>
> A final test for today is to make sure that the system also runs *without* a
> monitor attached so I will shut down and disconnect the monitor and then power
> on again and see what gives.
>
> But I will install TigerVNC first of course.
>
> Later:
> ------
> Another snag here!
> If I disconnect the physical monitor after I have installed and successfully
> tested TigerVNC on display :1, then it will *not* boot and since I have no
> display attached I cannot say how far it gets. In any case it never comes
> on-line on the LAN.
>
> Strangely if I leave the monitor cable in place but power down the monitor in
> the other end of the cable, then it boots and I can use VNC! What is the
> difference? Monitor disconnected or a powered down monitor in the other end of
> the cable?
>
> The monitor connection is by way of DiaplayPort, the HP PC has 2 of these and
> nothing else...
>
> So as it is now I cannot use it after all, since there will be no monitor
> attached in the end location. The plan was to have the PC stored in a cupboard
> somewhere and accessed via SSH and VNC. But of course that does not work if it
> behaves in this way.
>
> I have a dozen or so Raspberry Pi units which run a Debian variant of Linux.
> These will not behave like this, they boot reliably and if there is no monitor
> attached they still do. And I access them all via VNC just fine.
> I could never believe that Linux on PC hardware would behave like this...
>
>
> This is what I did to bypass the no monitor issue on one of my machines.
>
> https://rumorscity.com/2013/12/06/how-to-create-dummy-plugs-for-your-graphics-cards/
>
> Randy
>