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It true it has an uninstall but it does not uninstall the complete flatpak. Just the menu entries so if you don't want it running you need to do as I said.

you can not remove a flatpak program via software center. you have to use the following commands. [*]flatpak list --app [*]flatpak uninstall --delete-data App-ID (where delete-data App ID are the name of the program you want to uninstall. ) For instance say you want to remove gimp flatpak. It would ...

do you know what graphics card is in that machine? Does the live session boot to the DE? if it does please install Inxi (sudo apt install inxi) and issue this command in a terminal and post the output here.
inxi -Fxxzr

You might want to turn of secure boot in bios also if it's enabled.

I was a long time Mint user, still use it some. Reason I switched to Debian was because it has KDE/plasma and mint not longer supports that DE. The Free software movement is great until your hardware will not work and you will need propitiatory drivers. Which Debian now provides. So your concern is ...

I think you need to do what works for you. I use protonmail here use the web version so it's never really installed but find it to be a safe and secure e-mail client. Have also used Electron mail to access proton. I use the appimage version so it really not installed either both work well on Debian ...

Next time to boot up and it does not connect try restarting network manager with this command
systemctl restart NetworkManager
see if that works , at least you will not have to reboot if it does. If it does not work it should give an error message.

what is the setting in network manager for auto connect? is that box checked?

A bit late to the party but Happy Anniversary!

Nice write up enjoyed reading your journey. Thank you for posting.

this is not debian but is useful in learning Linux.
Linux Journey

Most of the time you get that message when you have a broken install of a package you can try this command and see if it clears it.

sudo dpkg --configure -a

Just had another thought (know that is dangerous) Did you install the i386 package with wine?
if not you may need to do Debian multarch found here:
how to debian mult arch
Many windows programs require 32bit libs. Just a thought.

I was going to suggest install playonlinux but it's not working in Debian 12 either. One of the things I like about playonlinux is that you can install older wine version without affecting the current system. But there is a python error that keeps it from working on Debian at the moment.

Couple things to try Is the wireless seeing the router in question?
Make sure secure boot is turned off in Bios. And for now disable IPV6 by right clicking on the wifi icon in the system tray and selection configure networks. Chang IPV6 from auto to ignored or disable. Let see if that helps.

Please list the output of these command:

sudo rfkill list

Then install inxi sudo apt install inxi once installed issue this command.
inxi -Nn
List results.

I would agree that Tor is the best at privacy. But it can be slow when on the web. You might look for a good compromise of speed with a good VPN that will do well.

I would also recommend synaptic. It just works. sudo apt install synaptic.

Should run fine, maybe not as snappy as an I5 or I7 but should be ok.
I would suggest at least 8 gigs of ram though. And an SSD drive for best performance.
Good Luck and enjoy!

I use proton mail and have had no problems reading e-mails. So not sure what could be causing the problem. I do you electron mail to access proton though. I would suggest your write to the proton developers with the problem they may have an answer for you. https://proton.me/support/account/get-help