2 min readJan 3, 2022


[Ubuntu 20.04][MySQL5.7]Problems installing mysql5.7 on Ubuntu 20.04

E: Sub-process /usr/bin/dpkg returned an error code (1)
by n 2022.01.03

First, you’ll need to follow this artical cause installing mysql5.7 to ubuntu 20.04 requires lots of manual settings.

Or follow this artical if you need to down grade from MySQL8

After this, you have a chance to meet the same error msg as I did.

E: Sub-process /usr/bin/dpkg returned an error code (1)

Which I found out the sequence for installing mysql-server should be

sudo apt-get install mysql-client=5.7*
sudo apt-get install mysql-community-client=5.7*
sudo apt-get install mysql-community-server=5.7*
sudo apt-get install mysql-server=5.7*

But if you meet the same error in installing client which show error like the following screen

mysqld: Can't read dir of '/etc/mysql/conf.d/'

You Could look into the folder and check the folders in it, and copy mysql.conf.d as conf.d by running the following command

cd /etc/mysql
sudo cp -r mysql.conf.d conf.d

Then you’ll find out all the installation works normal.

Like this story if you fix the issue =]