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Ubuntu 18.04にNvidia 418ドライバーをインストールすると、満たされていない依存関係エラーが発生するのはなぜですか？

独自のグラフィックスPPA を設定してapt updateを正常に実行しましたが、Nvidia 418ドライバーをインストールしようとすると、次のエラーが発生します。

$ Sudo apt install nvidia-driver-418
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-418 : Depends: libnvidia-gl-418 (= 418.56-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: nvidia-utils-418 (= 418.56-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: xserver-xorg-video-nvidia-418 (= 418.56-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: libnvidia-cfg1-418 (= 418.56-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: libnvidia-ifr1-418 (= 418.56-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Recommends: libnvidia-decode-418:i386 (= 418.56-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-encode-418:i386 (= 418.56-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-ifr1-418:i386 (= 418.56-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-fbc1-418:i386 (= 418.56-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-gl-418:i386 (= 418.56-0ubuntu0~gpu18.04.1)
E: Unable to correct problems, you have held broken packages.

たとえば、依存関係は確実に存在します。

$ Sudo apt-cache showpkg xserver-xorg-video-nvidia-418
Package: xserver-xorg-video-nvidia-418
Versions: 
418.56-0ubuntu0~gpu18.04.1 (/var/lib/apt/lists/ppa.launchpad.net_graphics-drivers_ppa_ubuntu_dists_bionic_main_binary-AMD64_Packages)
 Description Language: 
                 File: /var/lib/apt/lists/ppa.launchpad.net_graphics-drivers_ppa_ubuntu_dists_bionic_main_binary-AMD64_Packages
                  MD5: a1eb1a42f08cae3b2102de9da0cd2b3b
 Description Language: en
                 File: /var/lib/apt/lists/ppa.launchpad.net_graphics-drivers_ppa_ubuntu_dists_bionic_main_i18n_Translation-en
                  MD5: a1eb1a42f08cae3b2102de9da0cd2b3b


Reverse Depends: 
  nvidia-driver-418,xserver-xorg-video-nvidia-418 418.56-0ubuntu0~gpu18.04.1
Dependencies: 
418.56-0ubuntu0~gpu18.04.1 - libnvidia-cfg1-418 (5 418.56-0ubuntu0~gpu18.04.1) xorg-video-abi-24 (16 (null)) xorg-video-abi-23 (16 (null)) xorg-video-abi-20 (16 (null)) xorg-video-abi-19 (16 (null)) xorg-video-abi-18 (16 (null)) xorg-video-abi-15 (16 (null)) xorg-video-abi-14 (16 (null)) xorg-video-abi-13 (16 (null)) xorg-video-abi-12 (16 (null)) xorg-video-abi-11 (16 (null)) xorg-video-abi-10 (16 (null)) xorg-video-abi-8 (16 (null)) xorg-video-abi-6.0 (0 (null)) xserver-xorg-core (18 2:1.19.6-1ubuntu2~) xserver-xorg-core-hwe-18.04 (0 (null)) libc6 (2 2.2.5) 
Provides: 
418.56-0ubuntu0~gpu18.04.1 - xorg-driver-video (= ) xorg-driver-binary (= ) nvidia-driver-binary (= ) 
Reverse Provides:

これらの依存関係を自動的にインストールしないのはなぜですか？

driversaptnvidiaxorgdependencies
1
cqcallaw

私が既にインストールしたnvidia-driver-390パッケージの間で何らかの競合が発生しているようです。最初に既存のNvidiaドライバーパッケージを次のように削除した場合、nvida-driver-418パッケージのインストールは問題なく続行されます。

$ Sudo apt remove nvidia-driver-390 && Sudo apt autoremove
3
cqcallaw