I cannot install mysql on ubuntu 18.04 - mysql

Question

I am trying to install mysql-server on my ubuntu 18.04 ,but I am getting the dpkg error
The terminal output after sudo apt-get install mysql-server is
Reading package lists... Done Building dependency tree Reading
state information... Done The following additional packages will be
installed: libaio1 libevent-core-2.1-6 mysql-client-5.7
mysql-client-core-5.7 mysql-common mysql-server-5.7
mysql-server-core-5.7 Suggested packages: mailx tinyca The following
NEW packages will be installed: libaio1 libevent-core-2.1-6
mysql-client-5.7 mysql-client-core-5.7 mysql-common mysql-server
mysql-server-5.7 mysql-server-core-5.7 0 upgraded, 8 newly installed,
0 to remove and 0 not upgraded. Need to get 0 B/19.1 MB of archives.
After this operation, 155 MB of additional disk space will be used. Do
you want to continue? [Y/n] Y Preconfiguring packages ... Selecting
previously unselected package mysql-common. (Reading database ...
274343 files and directories currently installed.) Preparing to unpack
.../0-mysql-common_1%3a10.4.12+maria~eoan_all.deb ... Unpacking
mysql-common (1:10.4.12+maria~eoan) ... Selecting previously
unselected package libaio1:amd64. Preparing to unpack
.../1-libaio1_0.3.110-5ubuntu0.1_amd64.deb ... Unpacking libaio1:amd64
(0.3.110-5ubuntu0.1) ... Selecting previously unselected package
mysql-client-core-5.7. Preparing to unpack
.../2-mysql-client-core-5.7_5.7.29-0ubuntu0.18.04.1_amd64.deb ...
Unpacking mysql-client-core-5.7 (5.7.29-0ubuntu0.18.04.1) ...
Selecting previously unselected package mysql-client-5.7. Preparing to
unpack .../3-mysql-client-5.7_5.7.29-0ubuntu0.18.04.1_amd64.deb ...
Unpacking mysql-client-5.7 (5.7.29-0ubuntu0.18.04.1) ... Selecting
previously unselected package mysql-server-core-5.7. Preparing to
unpack .../4-mysql-server-core-5.7_5.7.29-0ubuntu0.18.04.1_amd64.deb
... Unpacking mysql-server-core-5.7 (5.7.29-0ubuntu0.18.04.1) ...
Selecting previously unselected package libevent-core-2.1-6:amd64.
Preparing to unpack
.../5-libevent-core-2.1-6_2.1.8-stable-4build1_amd64.deb ... Unpacking
libevent-core-2.1-6:amd64 (2.1.8-stable-4build1) ... Setting up
mysql-common (1:10.4.12+maria~eoan) ... Selecting previously
unselected package mysql-server-5.7. (Reading database ... 274503
files and directories currently installed.) Preparing to unpack
.../mysql-server-5.7_5.7.29-0ubuntu0.18.04.1_amd64.deb ... Unpacking
mysql-server-5.7 (5.7.29-0ubuntu0.18.04.1) ... Selecting previously
unselected package mysql-server. Preparing to unpack
.../mysql-server_5.7.29-0ubuntu0.18.04.1_all.deb ... Unpacking
mysql-server (5.7.29-0ubuntu0.18.04.1) ... Setting up
libevent-core-2.1-6:amd64 (2.1.8-stable-4build1) ... Setting up
libaio1:amd64 (0.3.110-5ubuntu0.1) ... Setting up
mysql-client-core-5.7 (5.7.29-0ubuntu0.18.04.1) ... Setting up
mysql-server-core-5.7 (5.7.29-0ubuntu0.18.04.1) ... Setting up
mysql-client-5.7 (5.7.29-0ubuntu0.18.04.1) ... Setting up
mysql-server-5.7 (5.7.29-0ubuntu0.18.04.1) ...
/var/lib/dpkg/info/mysql-server-5.7.postinst: line 191:
/usr/share/mysql-common/configure-symlinks: No such file or directory
dpkg: error processing package mysql-server-5.7 (--configure):
installed mysql-server-5.7 package post-installation script subprocess
returned error exit status 127 dpkg: dependency problems prevent
configuration of mysql-server: mysql-server depends on
mysql-server-5.7; however: Package mysql-server-5.7 is not
configured yet.
dpkg: error processing package mysql-server (--configure): dependency
problems - leaving unconfigured No apport report written because the
error message indicates its a followup error from a previous failure.
Processing triggers for libc-bin (2.27-3ubuntu1) ... Processing triggers for systemd (237-3ubuntu10.39)
... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Processing
triggers for ureadahead (0.100.0-21) ... ureadahead will be reprofiled
on next reboot Errors were encountered while processing:
mysql-server-5.7 mysql-server E: Sub-process /usr/bin/dpkg returned
an error code (1)
I have tried every other solution that I could find on stack overflow and elsewhere on the Internet.
The solutions that i have tried include purging mysql,autoremove,autoclean,dist upgrade,reboot,removing /etc/mysql /var/lib/mysql and almost every other thing that I could find related to this problem.It is not helping me, and now asking this question because no other answers were helping me.I am not worried of losing any DB that I might I have on my system.
I must add that since installing mysql was not working for me,I went with mongodb.It installed fine initally ,but now even removing and installing mongodb is givinf the same Error.

Answer 1

please try the following steps,
1.) First, update the apt package index by typing:
$sudo apt update
2.)Then install the MySQL package with the following command:
$sudo apt install mysql-server
3.)Once the installation is completed, the MySQL service will start automatically. To check whether the MySQL server is running, type:
$sudo systemctl status mysql
output
●
mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2020-2-20 11:30:23 PDT; 5min ago
Main PID: 17382 (mysqld)
Tasks: 27 (limit: 2321)
CGroup: /system.slice/mysql.service
`-17382 /usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pid