Problems running podman on Digital Ocean Droplet under Ubuntu 22.04

[mwoodpatrick]

I'm new to podman (but am experienced with docker). I'm trying to run podman on a Digital Ocean Droplet under Ubuntu 22.04, I have installed podman and podman version is showing:

Version:      3.4.4
API Version:  3.4.4
Go Version:   go1.17.3
Built:        Wed Dec 31 16:00:00 1969
OS/Arch:      linux/amd64

I was having problems building an image

podman build -t nginx https://git.io/Jf8ol
STEP 1/10: FROM debian:buster-slim
Resolved "debian" as an alias (/etc/containers/registries.conf.d/shortnames.conf)
Trying to pull docker.io/library/debian:buster-slim...
Getting image source signatures
Copying blob 4be315f6562f done
Error: error creating build container: writing blob: adding layer with blob "sha256:4be315f6562fccf08fd6c749557e31e45ab6d987370e20e2c4933ddb04ddd5ff": Error processing tar file(exit status 1): potentially insufficient UIDs or GIDs available in user namespace (requested 0:42 for /etc/gshadow): Check /etc/subuid and /etc/subgid: lchown /etc/gshadow: invalid argument

Is this expected?

I got further around by adding

podman --storage-opt ignore_chown_errors=true build -t nginx https://git.io/Jf8ol

But now I get

E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation

However, when I try to install it I see

sudo apt-get install gnupg
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
gnupg is already the newest version (2.2.27-3ubuntu2).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

It appears to be installed as gpgv

Doing

sudo ln -s /usr/bin/gpgv /usr/bin/gnupg2

Does not help the issue, Any suggestions on how to fix

[rhatdan]

Do you have entries in /etc/subuid and /etc/subgid files? If you modified them you need to do a
podman system migrate

[mwoodpatrick]

Yes I do

cat /etc/subuid
mwoodpatrick:100000:65536

 cat  /etc/subgid
mwoodpatrick:100000:65536

I had run

podman system migrate

but it did not help

I would appreciate any pointers in best way to debug this

[mheon]

Please provide the full output of podman info

[mwoodpatrick]

I just figured out my problem (wrong username in files), many thanks for your help