Hi Siddhant,
I see in your logs that the server failed to start after install.

>From your log:
2017-12-05T05:35:58.134939Z 0 [Note] Server hostname (bind-address): 
'127.0.0.1'; port: 3306
2017-12-05T05:35:58.134957Z 0 [Note]   - '127.0.0.1' resolves to '127.0.0.1';
2017-12-05T05:35:58.135028Z 0 [Note] Server socket created on IP: '127.0.0.1'.
2017-12-05T05:35:58.135048Z 0 [ERROR] Can't start server: Bind on TCP/IP port: 
Address already in use
2017-12-05T05:35:58.135053Z 0 [ERROR] Do you already have another mysqld server 
running on port: 3306 ?
2017-12-05T05:35:58.135068Z 0 [ERROR] Aborting


Now you might have another service on that port, you'd need to clean that 
collision up.
But actually your error log suggests that you eventually did so already and 
might just have reported the error afterwards.

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https://bugs.launchpad.net/bugs/1736853

Title:
  package mysql-server-5.7 5.7.20-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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