Hi,
the first one ...

N: Ignoring file '20auto-upgrades.ucf-dist' in directory
'/etc/apt/apt.conf.d/' as it has an invalid filename extension

... is an unrelated issue. In fact not so much an issue than a FYI
message telling you that since the update this file is no more active,
but still around if you want/need to retain anything.

The second one ...
aeltaib@aeltaib-PC:~$ mysql -u root -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket 
'/var/run/mysqld/mysqld.sock' (2)

... first seems to be bug 1670629, but that is about timing on upgrade.
But you report this connect after the upgrade.

On the upgrade itself the server fails to start, and due to that the upgrade is 
being considered failed.
>From the log:
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 Wed 2017-05-31 
14:30:33 EET; 7ms ago
  Process: 8758 ExecStartPost=/usr/share/mysql/mysql-systemd-start post 
(code=exited, status=0/SUCCESS)
  Process: 8757 ExecStart=/usr/sbin/mysqld (code=exited, 
status=1/FAILURE)
  Process: 8750 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre 
(code=exited, status=0/SUCCESS)
 Main PID: 8757 (code=exited, status=1/FAILURE)

May 31 14:30:33 aeltaib-PC systemd[1]: Failed to start MySQL Community 
Server.
May 31 14:30:33 aeltaib-PC systemd[1]: mysql.service: Unit entered 
failed state.
May 31 14:30:33 aeltaib-PC systemd[1]: mysql.service: Failed with 
result 'e...'.

An extended look at a full systemctl status mysql might shed some extra
light.

But mostly the last mysql start I think was crashed by (from the log):
2017-05-31T12:30:35.024009Z 0 [ERROR] Can't start server: Bind on TCP/IP port: 
Address already in use
2017-05-31T12:30:35.024015Z 0 [ERROR] Do you already have another mysqld server 
running on port: 3306 ?
2017-05-31T12:30:35.024029Z 0 [ERROR] Aborting

So is there anything running?

Questions:
- What are the permissions of /var/run/mysqld/mysqld.sock?
- Would it work if you run through sudo?
- if /var/run/mysqld/mysqld.sock which process owns it (lsof) and is that 
process running?
- output of "systemctl status mysql.service"
- is there a mysql running already?
- are the mysql configured ports un ise by something else?

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https://bugs.launchpad.net/bugs/1694705

Title:
  package mysql-server-5.7 5.7.18-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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