sudo dpkg-reconfigure locales
sudo vim /etc/apt/sources.list
默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
预发布软件源，不建议启用
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
=======================================
sudo apt-get update
sudo apt-get upgrade
=======================================
sudo apt-get install xrdp
///
sudo apt-get install xfce4
sudo apt-get install gnome
export DISPLAY=localhost:0
xfce4-session
///
sudo apt-get install xrdp
sudo sed -i 's/port=3389/port=3390/g' /etc/xrdp/xrdp.ini
sudo echo xfce4-session >~/.xsession
sudo service xrdp restart
chown -R bob:bob /home/bob
=======================================
sudo apt-get install ubuntu-desktop unity compizconfig-settings-manager
sudo apt-get install ubuntu-desktop unity compizconfig-settings-manager
compiz出现错误：
cd ~
切换到自己的home目录之后，
rm -rf .cache/compiz
rm -rf .cache/compiz-1
rm -rf .cache/compizconfig-1
rm -rf .config/compiz
rm -rf .config/compiz-1
rm -rf .config/compizconfig-1
rm -rf .gconf/apps/compiz
rm -rf .gconf/apps/compiz-1
rm -rf .gconf/apps/compizconfig-1
好像删完这个.config/compiz-1 好像就自动恢复了。
export DISPLAY=localhost:0
ccsm
compiz
安装了mysql 后，启动时，程序提示 “No directory, logging in with HOME=/”
sudo service mysql stop
sudo usermod -d /var/lib/mysql/ mysql //使用usermod命令来重新定位mysql所在的目录