Summary of Ubuntu20.04 problem solutions:
(The sources of the following solutions are all blogs or bilibili on this site, mainly to summarize personal problems)
Problem 1: Can't switch Chinese input
plan:
sudo apt-get install ibus-pinyin
Problem 2: Firefox cannot play videos
plan:
sudo apt install ffmpeg
Question 3: Windows and Linux system time synchronization
plan:
sudo apt install ntpdate
sudo ntpdate time.windows.com
sudo hwclock --localtime --systohc
Question 4: Uninstalling the software
plan:
sudo apt-get purge app名称
Problem 5: Changing the boot menu default items
plan:
sudo gedit /etc/default/grub # grub文件打开，查看第6行：GRUB_DEFAULT=0 ，0是启动菜单的第一项，第二项是1，以此类推，改成想要的默认项即可，保存退出
sudo update-grub # 更新grub文件
Skill:
Ctrl+shift+t calls out the terminal
top to view the process
kill -9 pid closes the corresponding process
Press esc, press i, display insert, you can edit
: wq vim save and exit
To be continued...