drop ubuntu 20.04 (#19657)

https://endoflife.date/ubuntu
> 31 May 2025

Author: altendky

.github/workflows/build-linux-installer-deb.yml

@@ -47,7 +47,7 @@ jobs:
     runs-on: ${{ matrix.os.runs-on }}
     needs:
       - version
-    container: chianetwork/ubuntu-20.04-builder:latest
+    container: chianetwork/ubuntu-22.04-builder:latest
     timeout-minutes: 120
     strategy:
       fail-fast: false
@@ -261,10 +261,6 @@ jobs:
             type: debian
             # https://packages.debian.org/bookworm/python/python3 (3.11)
             url: "docker://debian:bookworm"
-          - name: ubuntu:focal (20.04)
-            type: ubuntu
-            # https://packages.ubuntu.com/focal/python3 (20.04, 3.8)
-            url: "docker://ubuntu:focal"
           - name: ubuntu:jammy (22.04)
             type: ubuntu
             # https://packages.ubuntu.com/jammy/python3 (22.04, 3.10)

.github/workflows/test-install-scripts.yml

@@ -170,10 +170,6 @@ jobs:
           - name: rockylinux:9
             type: rocky
             url: "docker://rockylinux:9"
-          - name: ubuntu:focal (20.04)
-            type: ubuntu
-            # https://packages.ubuntu.com/focal/python3 (20.04, 3.8)
-            url: "docker://ubuntu:focal"
           - name: ubuntu:jammy (22.04)
             type: ubuntu
             # https://packages.ubuntu.com/jammy/python3 (22.04, 3.10)

install-timelord.sh

@@ -59,22 +59,6 @@ echo "${CHIAVDF_POETRY_INFO_VERSION}"
 CHIAVDF_VERSION="chiavdf==${CHIAVDF_POETRY_INFO_VERSION}"
 echo "${CHIAVDF_VERSION}"
 
-ubuntu_cmake_install() {
-  UBUNTU_PRE_2004=$(python -c 'import subprocess; id = subprocess.run(["lsb_release", "-is"], stdout=subprocess.PIPE); version = subprocess.run(["lsb_release", "-rs"], stdout=subprocess.PIPE); print(id.stdout.decode("ascii") == "Ubuntu\n" and float(version.stdout) < float(20.04))')
-  if [ "$UBUNTU_PRE_2004" = "True" ]; then
-    echo "Installing CMake with snap."
-    sudo apt-get install snapd -y
-    sudo apt-get remove --purge cmake -y
-    hash -r
-    sudo snap install cmake --classic
-    # shellcheck disable=SC1091
-    . /etc/profile
-  else
-    echo "Ubuntu 20.04LTS and newer support CMake 3.16+"
-    sudo apt-get install cmake -y
-  fi
-}
-
 symlink_vdf_bench() {
   if [ ! -e vdf_bench ] && [ -e venv/lib/"$1"/site-packages/vdf_bench ]; then
     echo ln -s venv/lib/"$1"/site-packages/vdf_bench
@@ -111,8 +95,6 @@ if [ -e "$THE_PATH" ]; then
 else
   if [ -e venv/bin/python ] && test "$UBUNTU_DEBIAN"; then
     echo "Installing chiavdf dependencies on Ubuntu/Debian"
-    # If Ubuntu version is older than 20.04LTS then upgrade CMake
-    ubuntu_cmake_install
     # Install remaining needed development tools - assumes venv and prior run of install.sh
     echo "apt-get install libgmp-dev libboost-python-dev $PYTHON_DEV_DEPENDENCY libboost-system-dev build-essential -y"
     sudo apt-get install libgmp-dev libboost-python-dev "$PYTHON_DEV_DEPENDENCY" libboost-system-dev build-essential -y