1 sudo passwd #first set su passwd

2 sudo apt install -y zsh #install zsh
chsh -s /bin/zsh

3 sudo vim /etc/hosts #no use for modify
sudo hostnamectl set-hostname <newhostname> #modify hostname

4 sougou for ubuntu process as follow:
(1)download the sougou.deb
(2)click to install
(3)input configure+reboot+fcitx configtuire

5 sudo apt install gnome-tweak-tool #for gnome shell
sudo apt install chrome-gnome-shell
sudo apt install gnome-shell-extensions
GNOME Shell integration # a browser extension

6 sudo add-apt-repository ppa:snwh/pulp
sudo apt-get update
sudo apt-get install paper-gtk-theme paper-icon-theme #gtk-theme no use and got from git repo

7 vimix theme install from github #like as ./install

8 lsb_release -a #view distribution version of linux
cat /etc/issue

9 sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo vim sources.list
#添加阿里源
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
#未发布源proposed
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
#不用源提高update速度
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

10 sudo apt-get install software1 software2
sudo apt-get remove s1 s2
sudo apt-get remove --purge s1
sudo apt-get update #update software info repo
sudo apt-get upgrade #system upgrade
sudo apt-cache search s1 s2
dpkg -i packagename.deb
dpkg -r pn.deb
dpkg -r --purge pn.deb
dpkg -info pn.deb