Everything I find tells me to use the PPA, which isn't possible for me atm since I don't yet have internet (and likely won't for a while) and this rooted phone can't teather or hotspot including through ADB.
So I need to download the packages/dependencies and transfer them to my PC to install them...
Where would I be able to find the packages I'm looking for??
You may try this "Nemo 3 file manager for Ubuntu" PPA by “WebUpd8” team. According to the PPA description:
(emphasis mine)
You may add this PPA by running
or browse for packages here.
Inside the PPA
Well you do need internet to download anything ...
That is weird: using a phone as a hotspot is always possible. It is a core feature of modern phones. Does not require a rooted phone either.
I would use a live usb session to create a Linux system. Use that to boot from it on a system that has internet, then download and install Nemo FM and then copy the files from /var/cache/apt/archives/ to your other system.