Libreshop, thank you for your suggestions and link to the article about
different commands for shutting down.
Yes I did contact Puri.sm and they suggested that it could be an issue with
systemd, or the swap partition, and suggested I run the poweroff command and
see if I get any error messages. Upon running the poweroff command, I got
the same result as before: I don't get any error messages that I can see,
there is some text that comes up but it flashes by so quickly I can't read
it, and goes to the screen with the pulsing logo, where it hangs forever.
When I told them this, they said: "As this seems to be related with the
operating system you are using now. I would recommend you to visit the
Trisquel support forums for it's users: https://trisquel.info/en/forum".
After reading your post and the article you linked, I tried "sudo shutdown -P
now" but got the same result as before. I tried sudo poweroff -f and it did
something different: it said, in the terminal, "Powering off.", but then sat
there forever doing nothing.
CalmStorm, did you have this same problem with Trisquel 8? Did you ever fix
it? Or switch to a different distribution? Do you have the same problem
with another distribution? What model laptop do you have?
Jabjabs, thank you for the suggestion about the wifi switch. Unfortunately,
this did not fix my problem.
dctrud, thank you for your suggestion about using a different kernel. This
looks very involved and I would hope to find a simpler solution if one is
available.
Does anyone have any further ideas? Much appreciated!
Boaz