There is an error in the instructions for installing the latest version of podman in Ubuntu environment.

There is an error in the software source configuration of the latest version of podman in the Ubuntu environment. The main problem is that the path part `https://download.opensuse.org/repositories/devel:kubic:libcontainers:unstable/` in the file devel:kubic:libcontainers:unstable.list does not match the real network address. The correct network address is `https://mirrorcache-us.opensuse.org/repositories/devel:/kubic:/libcontainers:/unstable/`.
However, apt cannot recognize the address `https://mirrorcache-us.opensuse.org/repositories/devel:/kubic:/libcontainers:/unstable/` very well, and an installation error will occur during the specific installation.

```
sudo mkdir -p /etc/apt/keyrings
curl -fsSL "https://download.opensuse.org/repositories/devel:kubic:libcontainers:unstable/xUbuntu_$(lsb_release -rs)/Release.key" \
| gpg --dearmor \
| sudo tee /etc/apt/keyrings/devel_kubic_libcontainers_unstable.gpg > /dev/null
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/devel_kubic_libcontainers_unstable.gpg]\
https://download.opensuse.org/repositories/devel:kubic:libcontainers:unstable/xUbuntu_$(lsb_release -rs)/ /" \
| sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:unstable.list > /dev/null
sudo apt-get update -qq
sudo apt-get -qq -y install podman
```