Can't install Cuda 11.7 using official instructions! Ubuntu 20.04,

I’m following the official instructions on Ubuntu 20.04 / x86_64:

$ wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/cuda-ubuntu2004.pin
--2022-07-06 16:11:22--  https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/cuda-ubuntu2004.pin
Resolving developer.download.nvidia.com (developer.download.nvidia.com)... 152.195.19.142
Connecting to developer.download.nvidia.com (developer.download.nvidia.com)|152.195.19.142|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 190 [application/octet-stream]
Saving to: ‘cuda-ubuntu2004.pin’

cuda-ubuntu2004.pin 100%[===================>]     190  --.-KB/s    in 0s      

2022-07-06 16:11:22 (5.93 MB/s) - ‘cuda-ubuntu2004.pin’ saved [190/190]

$ sudo mv cuda-ubuntu2004.pin /etc/apt/preferences.d/cuda-repository-pin-600
[sudo] password for <snip>: 

$ sudo apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/3bf863cc.pub
Executing: /tmp/apt-key-gpghome.PDZfZ4wr7y/gpg.1.sh --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/3bf863cc.pub
gpg: requesting key from 'https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/3bf863cc.pub'
gpg: key A4B469963BF863CC: public key "cudatools <cudatools@nvidia.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1

$ sudo add-apt-repository "deb https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/ /"
Get:1 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease [1,581 B]
Hit:2 http://us.archive.ubuntu.com/ubuntu focal InRelease                      
Get:3 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  Packages [579 kB]
Get:4 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]      
Get:6 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]   
Get:7 http://us.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [688 kB]
Get:8 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [1,947 kB]
Get:9 http://us.archive.ubuntu.com/ubuntu focal-updates/main Translation-en [353 kB]
Get:10 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [278 kB]
Get:11 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 c-n-f Metadata [15.6 kB]
Get:12 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [923 kB]
Get:13 http://us.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [677 kB]
Get:14 http://us.archive.ubuntu.com/ubuntu focal-updates/universe Translation-en [208 kB]
Get:15 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [390 kB]
Get:16 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [20.9 kB]
Get:17 http://us.archive.ubuntu.com/ubuntu focal-updates/multiverse i386 Packages [8,468 B]
Get:18 http://us.archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [24.5 kB]
Get:19 http://us.archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [944 B]
Get:20 http://us.archive.ubuntu.com/ubuntu focal-backports/main amd64 DEP-11 Metadata [8,000 B]
Get:21 http://us.archive.ubuntu.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [30.5 kB]
Get:22 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [40.7 kB]
Get:23 http://security.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [10.7 kB]
Get:24 http://security.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [66.9 kB]
Get:25 http://security.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [14.6 kB]
Get:26 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 DEP-11 Metadata [2,464 B]
Fetched 6,625 kB in 13s (523 kB/s)                                             
Reading package lists... Done
bbogart@supermicro:~/Downloads$ sudo apt-get update && sudo apt-get install cuda
Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease              
Hit:3 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease          
Hit:5 http://security.ubuntu.com/ubuntu focal-security InRelease             
Reading package lists... Done
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:
 cuda : Depends: cuda-11-7 (>= 11.7.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I gave up on 11.7 and went back to 10.2 (using the 18.04 repo) and installing “cuda-toolkit-10-2”, not “cuda” and that seems to be working.