ubuntu
sudo apt clean 中清理缓存，tf训练临时文件太大，一会功夫，几个G就没了。
sudo apt autoremove清理安装包，容易出错，谨慎处理。
运行清理后，nvidia-smi报错
NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest nvidia driver is installed and running.
只好重安装nvidia显卡驱动470
ls /usr/src | grep nvidia
sudo apt install dkms
sudo dkms install -m nvidia -v 470.57.02
sudo apt-get install dkms
sudo apt install dpkg-dev
sudo apt install libdpkg-perl
sudo apt install nvidia-driver-470
sudo apt-get update
sudo apt install nvidia-driver-470
sudo apt install nvidia-driver-470 --fix-missing
sudo ubuntu-drivers autoinstall
sudo apt-get update
sudo apt-get upgrade
sudo gedit /etc/modprobe.d/blacklist.conf
sudo update-initramfs -u
ubuntu-drivers devices
lsmod | grep nouveau
sudo gedit ~/.bashrc
sudo dpkg --list | grep nvidia-
conda清理，可节省几G的空间：
conda clean -p #不用的Package
conda clean -t #tar
conda clean -a #cache等。
