Ubuntu 24.04 LTS安装Python2失败解决

Ubuntu 24.04 LTS安装Python2失败解决

安装Ubuntu24.04之后，安装python2会提示：

~/$ sudoaptinstall python2

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python2' has no installation candidate

解决方式：

wget https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tgz
sudotar xzf Python-2.7.9.tgz
cd Python-2.7.9
sudo ./configure --enable-optimizations
sudomake altinstall

之后：

python2.7 -V
~ Python 2.7.9
sudoln-sfn'/usr/local/bin/python2.7''/usr/bin/python2'sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 1

设置可选择python版本：

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3  2sudo update-alternatives --config python  （选择切换Python版本）
python --version （查看Python版本）