It looks like this is intentional:
Preparing to unpack .../mysql-server-5.7_5.7.12-0ubuntu1_amd64.deb ...
Aborting downgrade from (at least) 10.0 to 5.7.
If are sure you want to downgrade to 5.7, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
Also note this message repeated often in your logs, perhaps your network
controller is unhappy:
[18317.930518] r8169 0000:01:00.0 enp1s0: rtl_counters_cond == 1 (loop:
1000, delay: 10).
** Information type changed from Private Security to Public
** Changed in: mysql-5.7 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1582044
Title:
package mysql-server-5.7 (not installed) failed to install/upgrade:
subprocess new pre-installation script returned error exit status 1
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