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you seem to have tried everything i would have tried
have you checked in the BIOS to see if boot from USB is enabled ?

not of much help but its worth a look ..

not sure if this is of any help but you may need
ReFind to make the USB bootable

https://www.howtogeek.com/213396/how-to-boot-a-linux-live-usb-drive-on-your-mac/

Refind should be available...

i believe that is for how long the download link is valid for ..

glad you got it fixed .. best of luck Steve ..

i use GUFW which i enable then set to 'public' it does most of the basic 'firewall stuff' that is needed ..

are you able to test the mouse on another system to eliminate problems with the mouse itself ? ..

have a look here on the Linux Mint forum ..

https://forums.linuxmint.com/viewtopic.php?t=409861

as it maybe the settings for the monitor that are causing the problems ..

i found this and there some older posts about the apple magic mouse but not a lot.

https://wiki.ubuntu.com/Multitouch/AppleMagicMouse

not sure if this will help is the ffmpeg direct download page for Ubuntu and Debian ..

https://ffmpeg.org/download.html

sorry about that the package is available in my synaptic that maybe due to me using LMDE.
i apologise ..

not sure if this is of help but ..

via synaptic you can install the ffmpeg-extra package/libs
this may have the required files you need ..

i have the same setup for Garmin Express Win 10 In Boxes.

go to the Win 10 ISO and Right click the ISO.
on that menu choose "open with"

then click on "Disk Image Writer"

then follow the...

it maybe worth while posting your software PPA lists
you can check in software and updates just to see what you have in them ..

note. in synaptic menu/edit there is 'fix broken packages' i was...

here is a howto if you wish to remove snaps ..

https://www.debugpoint.com/remove-snap-ubuntu/

or

https://www.baeldung.com/linux/snap-remove-disable

there are others that are similar ..

have a look here and see if it is of any help ..

https://forums.linuxmint.com/viewtopic.php?t=367823

you can check via synaptic and see if you have any broken packages.
fix broken packages is in the edit menu.

or in a terminal try ..

sudo dpkg --configure -a

sudo apt-get install -f

then...

are these links of any help ..

https://wiki.ubuntu.com/Touchscreen

https://www.linux.com/training-tutorials/how-configure-touchscreen-linux/
...

not sure if this is what you are looking for or even if it is of any help ..

https://mail.xfce.org/mailman/listinfo/xfce-bugs

if there is network installed it maybe worthwhile going back into the live system using the USB and re-check the network to see if its working.
if its not then maybe post a list of the network...

try getting into recovery mode and change the cursor back to default.

howto get into recovery mode.
https://wiki.ubuntu.com/RecoveryMode

just asking ..
have you checked within settings/network the DNS settings.

change the DNS (IP4) settings from auto to 1.1.1.1 or 8.8.8.8

see if the connection works now. i've had it several...

when i installed 24.04 it created a swap.img of 8.6GB on one system but no swap file/img on a second system. i have no idea why.

on the 1st system i deleted the swap.img file and set up manually...

two computers both had 22.04.4 LTS installed both systems were encrypted on install with the Ubuntu default settings 22.04.4 for the partitioning and installer.

1st. system .. HP 24" AiO .. Ryzen...

harsh but effective. glad you got it sorted ..

please try.

sudo snap remove --purge snapd-desktop-integration

then

sudo apt update
sudo apt install snapd

then