Shutdown sequence hangs at "Reached target Power-Off."
 

I boot two different versions of Xubuntu by ISO, 16 (Xenial) & 20 (Fossa).

Xenial shuts down normally. Fossa hangs at the title quote you can also see in the photo:

Attachment 42629

At that point I power-off with the power button. Am I missing a trick for Fossa shut down?

Just as a data point, does this occur when shutting down via the GUI and when shutting down via the CLI?

What does that mean?

Thus far I have only shut down using the GUI. I will try to remember the command line next session.

To check poweroff log

I apologize for my clumsy wording.

It was a bumbling way of asking for more information.

The CLI shutdown action is almost instantaneous, but the process still hangs like the GUI. Again this is only in Xubuntu Fossa. Xenial shuts down successfully.

What happens when you try the poweroff command?

Same glitch, CLI poweroff hangs at "Reached target Power-Off."

I was impressed how instantaneously the command executes.

Still struggling with this problem I'll rephrase it. Consider the two bit matrix:

USBFLASH or HD
OLDER or NEWER (distribution version)

This problem only exists in one of the four possibilities - HD-NEWER.

When I boot the NEWER .iso on the internal HD, it hangs during shutdown. I have to use the power button to force a shutdown.

The OLDER distro, or the NEWER distro by USBFLASH, shutdown normally.

potential causes?

I am only thinking to experiment with more distros.

you need to look for information like this: https://bbs.archlinux.org/viewtopic.php?id=290374
Probably changing the kernel will solve it. Or changing the video driver. (or something else). Unfortunately it is extremely hard to diagnose from a remote location.