Ubuntu

docker system prune -a

for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done
sudo apt-get autoremove

# ❯ for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done
# [sudo] password for kkumtree: 
# Reading package lists... Done
# Building dependency tree... Done
# Reading state information... Done
# The following packages were automatically installed and are no longer required:
#   bridge-utils containerd pigz runc ubuntu-fan
# Use 'sudo apt autoremove' to remove them.
# The following packages will be REMOVED:
#   docker.io
# 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
# After this operation, 126 MB disk space will be freed.
# Do you want to continue? [Y/n] Y
# (Reading database ... 465886 files and directories currently installed.)
# Removing docker.io (27.5.1-0ubuntu3~24.04.2) ...
# '/usr/share/docker.io/contrib/nuke-graph-directory.sh' -> '/var/lib/docker/nuke-graph-directory.sh'
# Stopping 'docker.service', but its triggering units are still active:
# docker.socket
# Processing triggers for man-db (2.12.0-4build2) ...
# (...)
# Removing containerd (1.7.28-0ubuntu1~24.04.1) ...
# Processing triggers for man-db (2.12.0-4build2) ...
# Reading package lists... Done
# Building dependency tree... Done
# Reading state information... Done
# The following packages were automatically installed and are no longer required:
#   bridge-utils pigz ubuntu-fan
# Use 'sudo apt autoremove' to remove them.
# The following packages will be REMOVED:
#   runc
# 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
# After this operation, 34.3 MB disk space will be freed.
# Do you want to continue? [Y/n] Y
# (Reading database ... 465640 files and directories currently installed.)
# Removing runc (1.3.0-0ubuntu2~24.04.1) ...
# Processing triggers for man-db (2.12.0-4build2) ...

# ❯ sudo apt-get autoremove
# Reading package lists... Done
# Building dependency tree... Done
# Reading state information... Done
# The following packages will be REMOVED:
#   bridge-utils pigz ubuntu-fan
# 0 upgraded, 0 newly installed, 3 to remove and 0 not upgraded.
# After this operation, 421 kB disk space will be freed.
# Do you want to continue? [Y/n] Y
# (Reading database ... 465612 files and directories currently installed.)
# Removing ubuntu-fan (0.12.16+24.04.1) ...
# ubuntu-fan: removing default /etc/network/fan configuration
# Removing bridge-utils (1.7.1-1ubuntu2) ...
# Removing pigz (2.8-1) ...
# Processing triggers for man-db (2.12.0-4build2) ...

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

sudo apt-get update -y && sudo apt-get upgrade -y  

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://prod-cdn.packages.k8s.io/repositories/isv:/kubernetes:/core:/stable:/v1.31/deb  InRelease: The following signatures were invalid: EXPKEYSIG 234654DA9A296436 isv:kubernetes OBS Project <isv:[email protected]>
W: Failed to fetch https://pkgs.k8s.io/core:/stable:/v1.31/deb/InRelease  The following signatures were invalid: EXPKEYSIG 234654DA9A296436 isv:kubernetes OBS Project <isv:[email protected]>
W: Some index files failed to download. They have been ignored, or old ones used instead.

sudo su
ls -l /lib/systemd/system/runlevel?.target*