Just a few updates which may be of use to anyone else having the same
issues...
1). As this issue persists without a truly good solution, it may be a
good idea to simply replace the wifi card with, say, an Atheros one
which works better. You can find them relatively cheaply on ebay.

2). One of the major issues that I was having was that my main Wifi
would crash internally, then whenever I tried to plug in a USB Wifi
adapter they wouldn't work either, leaving me literally without any
method of getting (wireless) internet. I assumed these two issues were
connected, however, further research has led me to believe otherwise.

I tried entirely removing the internal wifi card to see if that would
make a difference on the USB wifi cards, yet still neither of mine
worked. Further looking revealed one or two strange oddities...

phy#1
        Interface wlx000f6001cb1f
                ifindex 3
                wdev 0x100000001
                addr 00:0f:60:01:cb:1f
                type managed
                txpower 20.00 dBm

The interface is WAY out of convention. As explained here
(https://superuser.com/questions/1086632/wlan1-showing-as-weird-
characters#1086705), interface names are limited to 16 bytes. My theory
is that when network-manager tries to connect with this interface, it
breaks that limit. The solution suggested in that thread works, append
net.ifnames=0 to the kernel parameters in grub and suddenly all of my
USB wifi adapters work fantastically.

I have a feeling this itself may warrant a separate bug report, I'll do
some looking and see if anyone else is having the same issue/if
someone's already reported it.

TL;DR: If your USB wifi doesn't work and you get weird/long interface
names from "iw dev", use "net.ifnames=0" to fix the interface name and
take back your wifi.

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https://bugs.launchpad.net/bugs/1684213

Title:
  Intel Wireless 7260 often crashes

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