nvidia-smi 失败：
$ nvidia-smi
NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.
这台机器上似乎事先安装了 nvidia [尝试？]。我该如何清理这个？
$ sudo ubuntu-drivers autoinstall
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved …我已经安装了python3.8，但没有找到有关如何pip3在 上与其交谈的参考ubuntu。我macos已经明确安装了pip3.8，这对于正确排列所有软件包至关重要。
pip3根据众多建议安装如下：
sudo apt-get install python3-pip
但它指向的是python3.6：
$ pip3 -V
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
请不要提示anaconda或者venv：有原因我们都是直接使用安装的python3.8。