Completely removing old Nvidia drivers

I recently installed a fresh installation of Ubuntu, and downloaded some Nvidia drivers via nvidia-driver-390. I noticed that nvidia-340 was also installed (as a "binary driver" instead of a "driver metapackage"). Interesting. Later, I installed nvidia-driver-396. I'd like to remove versions 340 and 390, so I can only use 396. I have used sudo apt remove --purge nvidia-340 nvidia-390 and also uninstalled some of the related packages (nvidia-common, nvidia-current, nvidia-settings, nvidia-prime, nvidia-kernel-common*, etc.) At this point, I'm just trying to remove every trace of Nvidia drivers from my system and start fresh. Unfortunately, in the included "Software and Updates", drivers 340, 390, and 396 are still listed. A screenshot is attached. Thanks for your help.

ls -la /etc/apt/sources.list.d:

total 44
drwxr-xr-x 2 root root 4096 Jul 10 08:43 .
drwxr-xr-x 6 root root 4096 May 20 12:58 ..
-rw-r--r-- 1 root root  142 Jul 10 08:43 alexlarsson-ubuntu-flatpak-bionic.list
-rw-r--r-- 1 root root  142 Jul 10 08:43 alexlarsson-ubuntu-flatpak-bionic.list.save
-rw-r--r-- 1 root root   57 Jul 10 08:43 etcher.list

-rw-r--r-- 1 root root   57 Jul 10 08:43 etcher.list.save
-rw-r--r-- 1 root root  132 Jul 10 08:43 gezakovacs-ubuntu-ppa-bionic.list
-rw-r--r-- 1 root root  132 Jul 10 08:43 gezakovacs-ubuntu-ppa-bionic.list.save
-rw-r--r-- 1 root root  189 Jul 10 08:43 google-chrome-beta.list
-rw-r--r-- 1 root root  189 Jul 10 08:43 google-chrome-beta.list.save
-rw-r--r-- 1 root root  144 Jul 10 08:43 graphics-drivers-ubuntu-ppa-bionic.list

Notes: So you have to remove the ppa to completely remove it?

cat /etc/apt/sources.list:

# deb cdrom:[Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic main restricted

## Major bug fix updates produced after the final release of the

## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic universe
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe

# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse


## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner

deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe

# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-proposed main universe restricted multiverse

ubuntu-drivers devices:

== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
modalias : pci:v000010DEd00001382sv000010DEsd00001065bc03sc00i00

vendor   : NVIDIA Corporation
model    : GM107 [GeForce GTX 745]
driver   : nvidia-340 - third-party free
driver   : nvidia-driver-390 - third-party free
driver   : nvidia-driver-396 - third-party free recommended
driver   : xserver-xorg-video-nouveau - distro free builtin

== /sys/devices/pci0000:00/0000:00:1c.7/0000:04:00.0 ==
modalias : pci:v000014E4d00004365sv00001028sd00000016bc02sc80i00
vendor   : Broadcom Limited

model    : BCM43142 802.11b/g/n (Wireless 1704 802.11n + BT 4.0)
driver   : bcmwl-kernel-source - distro non-free

Note: The second one is my wireless card, the first one is my graphics card that this is about.

ubuntu-drivers list:

nvidia-driver-390
nvidia-340

nvidia-driver-396
bcmwl-kernel-source

Note: Again, the first three are the ones I want to remove, and the last is for my wireless card.

1. nvidia-installer --uninstall


2. sudo apt remove nvidia-*