As per subject I'm trying to install the drivers version 455 on Ubuntu 20.04.
I have enabled the ppa:

sudo add-apt-repository ppa:graphics-drivers/ppa

sudo apt-get update

And I can see the drivers as package nvidia-graphics-drivers-455.
But when I try to install them with

ema@scv:~$ sudo apt install nvidia-graphics-drivers-455

I get:

Reading package lists... Done

Building dependency tree       

Reading state information... Done

E: Unable to locate package nvidia-graphics-drivers-455

Output of update and dist-upgrade

ema@scv:~$ sudo apt update && sudo apt dist-upgrade 

Hit:1 http://gb.archive.ubuntu.com/ubuntu focal InRelease

Hit:2 http://gb.archive.ubuntu.com/ubuntu focal-updates InRelease

Hit:3 http://gb.archive.ubuntu.com/ubuntu focal-backports InRelease

Hit:4 http://archive.canonical.com/ubuntu focal InRelease

Hit:5 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu focal InRelease

Hit:6 http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal InRelease                                    

Hit:7 http://security.ubuntu.com/ubuntu focal-security InRelease                                                                     

Hit:8 https://dl.winehq.org/wine-builds/ubuntu focal InRelease                                                                       

Hit:9 https://download.virtualbox.org/virtualbox/debian focal InRelease 

Reading package lists... Done                           

Building dependency tree       

Reading state information... Done

All packages are up-to-date.

N: Skipping acquisition of configured file 'contrib/binary-i386/Packages', as repository 'https://download.virtualbox.org/virtualbox/debian focal InRelease' doesn't support architecture 'i386'

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Calculating upgrade... Done

0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.

Now I'm getting the package nvidia-driver-455, but it tells me the following:

ema@scv:~$ sudo apt install nvidia-driver-455

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Some packages could not be installed. This may mean that you have

requested an impossible situation or if you are using the unstable

distribution that some required packages have not yet been created

or been moved out of Incoming.

The following information may help to resolve the situation:



The following packages have unmet dependencies.

 nvidia-driver-455 : Depends: libnvidia-gl-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: nvidia-dkms-455 (<= 455.23.04-1) but it is not going to be installed

                     Depends: nvidia-dkms-455 (>= 455.23.04) but it is not going to be installed

                     Depends: nvidia-kernel-source-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: libnvidia-extra-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: nvidia-compute-utils-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: libnvidia-decode-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: libnvidia-encode-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: nvidia-utils-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: xserver-xorg-video-nvidia-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: libnvidia-cfg1-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: libnvidia-ifr1-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Depends: libnvidia-fbc1-455 (= 455.23.04-0ubuntu0~0.20.04.1) but it is not going to be installed

                     Recommends: libnvidia-compute-455:i386 (= 455.23.04-0ubuntu0~0.20.04.1)

                     Recommends: libnvidia-decode-455:i386 (= 455.23.04-0ubuntu0~0.20.04.1)

                     Recommends: libnvidia-encode-455:i386 (= 455.23.04-0ubuntu0~0.20.04.1)

                     Recommends: libnvidia-ifr1-455:i386 (= 455.23.04-0ubuntu0~0.20.04.1)

                     Recommends: libnvidia-fbc1-455:i386 (= 455.23.04-0ubuntu0~0.20.04.1)

                     Recommends: libnvidia-gl-455:i386 (= 455.23.04-0ubuntu0~0.20.04.1)

E: Unable to correct problems, you have held broken packages.

Not sure what's going on.
Has anyone any Idea why this would happen?

Thanks!