我正在尝试在我的 Ubuntu 17.04 上安装 Tinker ，但是有些它似乎不起作用，我在终端上使用了所有这些命令
sudo apt-get install update
sudo apt-get install upgrade
sudo apt-get install python-tk
sudo apt-get install python3-tk
每次我都会：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python-tk 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 'python-tk' has no installation candidate