Problems encountered in installing MySQL in docker Ubuntu container

#  After pulling the image 
#  Start the container   Be sure to configure permissions   Appoint --privileged=true, 
docker run -itd --privileged=true --name=ubuntudemo ubuntu:16.04 /bin/bash
#  Otherwise, the error is reported as follows 
Setting up mysql-server-5.7 (5.7.36-0ubuntu0.18.04.1) ...
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline
invoke-rc.d: could not determine current runlevel
invoke-rc.d: policy-rc.d denied execution of stop.
update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode
Renaming removed key_buffer and myisam-recover options (if present)
Cannot stat file /proc/244/fd/0: Permission denied
Cannot stat file /proc/244/fd/1: Permission denied
Cannot stat file /proc/244/fd/2: Permission denied
Cannot stat file /proc/244/fd/3: Permission denied
Cannot stat file /proc/244/fd/4: Permission denied
Cannot stat file /proc/244/fd/5: Permission denied
Cannot stat file /proc/244/fd/6: Permission denied
Cannot stat file /proc/244/fd/7: Permission denied
Cannot stat file /proc/244/fd/8: Permission denied
Cannot stat file /proc/244/fd/9: Permission denied
Cannot stat file /proc/244/fd/10: Permission denied
Cannot stat file /proc/244/fd/11: Permission denied
Cannot stat file /proc/244/fd/12: Permission denied
Cannot stat file /proc/244/fd/13: Permission denied
Cannot stat file /proc/244/fd/14: Permission denied
Cannot stat file /proc/244/fd/15: Permission denied
Cannot stat file /proc/244/fd/16: Permission denied
Cannot stat file /proc/244/fd/17: Permission denied
Cannot stat file /proc/244/fd/18: Permission denied
Cannot stat file /proc/244/fd/19: Permission denied
Cannot stat file /proc/244/fd/20: Permission denied
Cannot stat file /proc/244/fd/21: Permission denied
Cannot stat file /proc/244/fd/22: Permission denied
Cannot stat file /proc/244/fd/23: Permission denied
Cannot stat file /proc/244/fd/24: Permission denied
Cannot stat file /proc/244/fd/25: Permission denied
invoke-rc.d: could not determine current runlevel
invoke-rc.d: policy-rc.d denied execution of start.
Setting up libfcgi-perl (0.78-2build1) ...
Setting up libhtml-tagset-perl (3.20-3) ...
Setting up mysql-server (5.7.36-0ubuntu0.18.04.1) ...
Setting up libencode-locale-perl (1.05-1) ...
Setting up libtimedate-perl (2.3000-2) ...
Setting up libio-html-perl (1.001-1) ...
Setting up libhtml-parser-perl (3.72-3build1) ...
Setting up libcgi-pm-perl (4.38-1) ...
Setting up libhttp-date-perl (6.02-1) ...
Setting up libhtml-template-perl (2.97-1) ...
Setting up libcgi-fast-perl (1:2.13-1) ...
Setting up libhttp-message-perl (6.14-1) ...
Processing triggers for libc-bin (2.27-3ubuntu1.4) ...
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#  install mysql  There may be a mistake 
# MYSQL Login time ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket 
#  terms of settlement 
mkdir -p /var/run/mysqld
chown mysql /var/run/mysqld/
service mysql restart

#  details   May refer to  https://blog.csdn.net/huliqi789/article/details/120989539