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mysqlを再インストールできません：mysql-serverはmysql-server-5.7に依存していますが、パッケージmysql-server-5.7はまだ構成されていません

Ubuntu 16.04でMySQLをアンインストールして再インストールしようとしていますが、多くの方法を見てきましたが、なぜエラーが発生するのかわかりません。

$ Sudo apt-get install mysql-server
mysql-server is already the newest version (5.7.17-0ubuntu0.16.04.2).
The following package was automatically installed and is no longer required:
  snap-confine
Use 'Sudo apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Setting up mysql-server-5.7 (5.7.17-0ubuntu0.16.04.2) ...
Renaming removed key_buffer and myisam-recover options (if present)
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
invoke-rc.d: initscript mysql, action "start" failed.
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Mi 2017-04-26 12:15:04 EEST; 5ms ago
  Process: 13693 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=1/FAILURE)

apr 26 12:15:04 alex-X750JB systemd[1]: Failed to start MySQL Community Server.
apr 26 12:15:04 alex-X750JB systemd[1]: mysql.service: Unit entered failed state.
apr 26 12:15:04 alex-X750JB systemd[1]: mysql.service: Failed with result 'exit-code'.
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 1
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.
                                                                                                          Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)

私はこれらの手順を試しました：

Sudo apt-get purge mysql*
Sudo apt-get autoremove
Sudo apt-get autoclean
Sudo apt-get dist-upgrade
Sudo apt-get install mysql-server

Sudo apt-get install mysql-serverを使用するまで、すべてうまくいきます

systemctl status mysql.serviceを実行した場合：

● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: inactive (dead) (Result: exit-code) since Mi 2017-04-26 13:30:19 EEST; 11min ago
  Process: 17650 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=1/FAILURE)

apr 26 13:30:18 alex-X750JB systemd[1]: Failed to start MySQL Community Server.
apr 26 13:30:18 alex-X750JB systemd[1]: mysql.service: Unit entered failed state.
apr 26 13:30:18 alex-X750JB systemd[1]: mysql.service: Failed with result 'exit-code'.
apr 26 13:30:19 alex-X750JB systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
apr 26 13:30:19 alex-X750JB systemd[1]: Stopped MySQL Community Server.
apr 26 13:30:19 alex-X750JB systemd[1]: mysql.service: Start request repeated too quickly.
apr 26 13:30:19 alex-X750JB systemd[1]: Failed to start MySQL Community Server.
aptpackage-managementmysql
3
alex

here の指示に従い、mysql-serverを再インストールして実行しました。

0
alex