I get bash: mate-power-manager: command not found

If I put sudo in front I get: sudo: mate-power-manager: command not found

It doesn't help if I put in mate-power-manager-common either.

EDIT:
I also tried to reinstall it in hopes the same error message would pop up again, but it did not.

Thanks Rolfie for the suggestion to search askUbuntu. I found something there that seems to be working:

[Disable suspend (upower)]
Identity=unix-user:*
Action=org.freedesktop.upower.suspend
ResultActive=no
ResultInactive=no
ResultAny=no

[Disable suspend (logind)]
Identity=unix-user:*
Action=org.freedesktop.login1.suspend
ResultActive=no
ResultInactive=no
ResultAny=no

[Disable suspend when others are logged in (logind)]
Identity=unix-user:*
Action=org.freedesktop.login1.suspend-multiple-sessions
ResultActive=no
ResultInactive=no
ResultAny=no

I put this where you suggested (/etc/polkit-1/localauthority/50-local.d) with your file name (enable-shutdown-reboot.pkla), and it seems to be working, even without a reboot. I will continue to monitor this throughout the day (with multiple reboots) and report back.

EDIT:
Didn't notice at first that this only dropped suspend from the shut down menu. So I went back and made this file look like this and that also removed hibernate:

[Disable suspend (upower)]
Identity=unix-user:*
Action=org.freedesktop.upower.suspend
ResultActive=no
ResultInactive=no
ResultAny=no

[Disable suspend (logind)]
Identity=unix-user:*
Action=org.freedesktop.login1.suspend
ResultActive=no
ResultInactive=no
ResultAny=no

[Disable suspend when others are logged in (logind)]
Identity=unix-user:*
Action=org.freedesktop.login1.suspend-multiple-sessions
ResultActive=no
ResultInactive=no
ResultAny=no

[Disable hibernate (upower)]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=no
ResultInactive=no
ResultAny=no

[Disable hibernate (logind)]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate
ResultActive=no
ResultInactive=no
ResultAny=no

[Disable hibernate when others are logged in (logind)]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate-multiple-sessions
ResultActive=no
ResultInactive=no
ResultAny=no

Read that thread and followed GNUser's advice in installing lightdm and libpolkit-backend-1-0-elogind and libpolkit-gobject-1-0-elogind. I'm still getting suspend and hibernate in the shut down menu. Did I forget to do something else?

BTW, last night I removed hibernate & uswsusp as MiyoLinux wrote. Then I looked up upower in Synaptic to see what would happen if I deleted that also. It would have removed the Mate desktop as well! That doesn't seem right. And I still had suspend and hibernate in the shut down menu.

Also, this reminded me of another thing. In the Mate control center, I don't have any link to Power Management. I downloaded the mate-power-manager-common app, but still no dice. I do remember after installing it some kind of error message popped up which unfortunately I didn't write down.

I have a feeling that all of this is somehow related. Anyone have any advice?

Thanks MiyoLinux. I already had the "ugly" installed but I needed the "bad." So it's now working. If you can remember how you found out it needed both these plugins, I'd appreciate knowing. I searched last night and came up empty. I did look at the dependencies listed in Synaptic, and I had them all. But gstreamer1.0-plugins-bad wasn't listed in Synaptic. Why would that be? It lists gstreamer1.0-plugins-base & gstreamer1.0-plugins-good. (Is there a gstreamer package that includes all this stuff so a user wouldn't have to download a bunch of different ones?

Thanks again.

Yes, that's it. It doesn't work on my system, on either Jessie or ASCII.

Never mind about the login sound. I found out how to fix it. I just changed paplay to aplay. Lucky guess!

I removed the post because I figured it out.  I compared the caja packages I had installed between Jessis and Ascii, and installed the ones I had in Jessie but was missing in Ascii. That gave me the "open as administrator" option back. Thank you for your help.

So, now Ascii appears to be running just fine on my system. If I have anymore problems I will post here again. By the way, I switched back to slim. Both slim and lightdm worked fine as long as I have haveged installed. (Thanks once again to GNUser.)

The problem is not during the boot. It's during the login to the OS.

I'll try an OS reinstall without deleting anything. But I won't be able to get to it until late tonight. Will post results back later tonight.