Pgadmin4 Debian

Hi!

pgadmin4 does not start up on debian buster

Process:
apt-get install pgadmin4

Get:2 http://apt.postgresql.org/pub/repos/apt buster-pgdg/main amd64
pgadmin4 amd64 4.18-1.pgdg100+1 [272 kB]
Get:3 http://apt.postgresql.org/pub/repos/apt buster-pgdg/main amd64
pgadmin4-common all 4.18-1.pgdg100+1 [3045 kB]

$ pgadmin4
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kobaz'
Python path:
"/home/kobaz/.virtualenvs/pgadmin4/lib/python3.4/site-packages:/usr/lib/python3/dist-packages"
Python Home: ""
Webapp path: "/usr/share/pgadmin4/web/pgAdmin4.py"
NOTE: Configuring authentication for DESKTOP mode.

pgAdmin splash pops up, and eventually says 'Taking longer than usual'.
'Almost there' and then dumps this:

The application server could not be contacted

I've tried cleaning out my pgadmin4 python path:
rm -rf /home/kobaz/.virtualenvs/pgadmin4

I've also tried startingconfig from scratch:
mv ~/.pgadmin ~/.pgadmin-old

This has not resolved the issue.

strace is showing a loop on:

poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=3545, ...}) = 0

Other items of note:

[pid 10122] connect(18, {sa_family=AF_INET, sin_port=htons(46311),
sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ECONNREFUSED (Connection refused)

There's no firewall rules or other network type access restrictions on
this box.

For example as my non-root user I can:
nc -l -s 127.0.0.1 -p 46311

And then successfully connect to it with another nc