Im working on ubuntu 23.04 and python 3.11.4, im unable to install mininet .
after this command mininet/util/install.sh -a

Detected Linux distribution: Ubuntu 23.04 lunar amd64
sys.version_info(major=3, minor=11, micro=4, releaselevel=’final’, serial=0)
Detected Python (python3) version 3
Installing all packages except for -eix (doxypy, ivs, nox-classic)…
Install Mininet-compatible kernel if necessary
Hit:1 http://archive.ubuntu.com/ubuntu lunar InRelease
Hit:2 https://dl.google.com/linux/chrome/deb stable InRelease
Hit:3 http://archive.ubuntu.com/ubuntu lunar-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu lunar-backports InRelease
Ign:5 https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu lunar InRelease
Err:6 https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu lunar Release
404 Not Found [IP: 185.125.190.80 443]
Reading package lists… Done
E: The repository ‘https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu lunar Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
could anyone tell what the problem and how to resolve

i tried installing mininet Proceed with the installation by running the installation script:
sudo util/install.sh -a