pgadmin4 missing for Ubuntu 20.04 (focal)

Hello,
there should be pgadmin4 for Ubuntu 20.04 (focal) according to
https://wiki.postgresql.org/wiki/Apt
but there isn't.

$ cat /etc/apt/sources.list.d/pgdg.list
deb http://apt.postgresql.org/pub/repos/apt/ focal-pgdg main
$ sudo apt update
Ign:1 http://binaries.erlang-solutions.com/debian focal InRelease
Hit:2 http://binaries.erlang-solutions.com/debian focal Release
Hit:3 http://apt.postgresql.org/pub/repos/apt focal-pgdg InRelease
Ign:4 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 https://repo.skype.com/deb stable InRelease
Hit:6 https://deb.nodesource.com/node_12.x focal InRelease
Hit:7 https://download.docker.com/linux/ubuntu eoan InRelease
Hit:8 http://dl.google.com/linux/chrome/deb stable Release
Get:10 http://security.ubuntu.com/ubuntu focal-security InRelease [107 kB]
Hit:11 http://cz.archive.ubuntu.com/ubuntu focal InRelease
Hit:12 http://cz.archive.ubuntu.com/ubuntu focal-updates InRelease
Get:13 http://cz.archive.ubuntu.com/ubuntu focal-backports InRelease [98.3
kB]
Fetched 205 kB in 1s (176 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as
repository 'http://apt.postgresql.org/pub/repos/apt focal-pgdg InRelease'
doesn't support architecture 'i386'
$ sudo apt-get install pgadmin4
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package pgadmin4 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'pgadmin4' has no installation candidate