Hello and thank you for filing this bug report.
>From DpkgTerminalLog.txt:
[?1049lAborting downgrade from (at least) 5.6 to 5.5.
If are sure you want to downgrade to 5.5, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
Are you downgrading a MySQL installation?
** Changed in: mysql-5.5 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1670136
Title:
package mysql-server-5.5 5.5.54-0ubuntu0.14.04.1 failed to
install/upgrade: subprocess new pre-installation script returned error
exit status 1
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