The same is happening on my system.
I used strace to see errors in the installation, and i saw this line in
/tmp/trace
open("/var/lib/dpkg/info/mysql-server-5.7.triggers", O_RDONLY) = -1
ENOENT (No such file or directory)
Can this be the culprit?
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https://bugs.launchpad.net/bugs/1573279
Title:
package mysql-server-5.7 5.7.11-0ubuntu6 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1 during release upgrade
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