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I want to reinstall mysql in Ubuntu 16.04.

mysql-server is already the newest version (5.7.21-0ubuntu0.16.04.1).
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 mysql-server : Depends: mysql-server-5.7 but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

After this I wrote a code for removing mysql, but it's not being removed.

sudo apt-get purge mysql-server mysql-client mysql-common mysql-server-core-* mysql-client-core-*
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'mysql-server-core-5.1' for glob 'mysql-server-core-*'
Note, selecting 'mysql-server-core-5.5' for glob 'mysql-server-core-*'
Note, selecting 'mysql-server-core-5.6' for glob 'mysql-server-core-*'
Note, selecting 'mysql-server-core-5.7' for glob 'mysql-server-core-*'
Package 'mysql-server-core-5.6' is not installed, so not removed
Package 'mysql-server-core-5.5' is not installed, so not removed
Package 'mysql-server-core-5.1' is not installed, so not removed
Note, selecting 'mysql-client-core-5.5' for glob 'mysql-client-core-*'
Note, selecting 'mysql-client-core-5.6' for glob 'mysql-client-core-*'
Note, selecting 'mysql-client-core-5.7' for glob 'mysql-client-core-*'
Package 'mysql-client-core-5.5' is not installed, so not removed
Package 'mysql-client-core-5.6' is not installed, so not removed
Package 'mysql-client' is not installed, so not removed
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 libmysqlclient20 : Depends: mysql-common (>= 5.5) but it is not going to be installed
 mariadb-common : Depends: mysql-common (>= 5.6.25) but it is not going to be installed
 mysql-client-5.7 : Depends: mysql-client-core-5.7 but it is not going to be installed
                    Depends: mysql-common (>= 5.5) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

closed as unclear what you're asking by David Foerster, user68186, Elder Geek, waltinator, RoVo Apr 11 '18 at 9:09

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0

You can try these steps:

  1. This removes mysql-server from your System.

    apt-get autoremove mysql-server
    
  2. Check if you still have mysql installed.

    mysql -V
    
  3. This installs mysql-server

    apt-get install mysql-server
    

If you are still having having issues start with

apt-get install -f

If it still does not work try:

dpkg-reconfigure mysql-server

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