Description of the problem: sudo apt-get install mysql-client-core-5.7, when using this command to install the MySQL client program today, an error occurs
When executed in solution, the code
sudo dpkg --configure -a
Another error occurred, the process is occupied
Solution:
1. Find the lock file process
lsof /var/lib/dpkg/lock-frontend
Find out its PID, write it down
2. Terminate the process
sudo kill -9 PID
After inputting, enter lsof /var/lib/dpkg/lock-frontend, there is no locked process
3. Remove the lock and reconfigure dpkg
sudo rm /var/lib/dpkg/lock-frontend
sudo dpkg --configure -a
After execution, enter sudo apt-get install mysql-client-core-5.7
problem solved