I wish! I did use @Ponce-De-Leon 's idea of downloading the acpi-call-dkms .deb file. I couldn't put it on the Zorin installation USB stick (write-protected), but I did put it in an attached backup SSD.
One of the things I realized was heating up the box during the startup was checking the MD5 checksums, so I cancelled that.
For whatever reason, when I try starting up in "safe graphics" mode, it churns for a while, then I get a "Catch 22" prompt to remove the installation media and press Enter. It doesn't matter whether I remove the USB stick or not, once I press Enter, it shuts down.
If I just use the first menu option, Zorin-to-try comes up (nice!) and I can connect to my WiFi, point to the backup .deb file and install it. I then have to do the sudo modprobe thing to enable it, and run the command to turn off the GPU. That sets up the next "Catch-22". Now, when I fire up the installer, it gets to a point and the screen fills with messages about timeout for the nouveau driver (SHEESH!), then shuts down.
The laptop sits atop a pretty good cooling pad but it's not enough.
Yes, I know, @applecheeks37 . Probably what really needs to be done. I have done it at least once, probably twice, before, and I am always afraid of screwing something up when I do it. The last time I did it, when I thought I had put everything back together, I had a screw left over from somewhere.
I've got some super thermal paste (last time I used thermal sheet) and a new fan (not that the old one's bad, I just figured I should try replacing it; this laptop chipset does not allow things like CPU undervolting and fan speed control, BTW). I've been putting this off for some time now.
Maybe I can take my laptop into a cold storage room and install Zorin. 