I just ran into this same issue with 5.7.29-0ubuntu0.16.04.1. It is
caused by a race condition.
It is a rather large MySQL database, so stopping & starting up the
daemon takes some time. Tried 'apt-get -f install' multiple times to no
avail.
After going over the code in /var/lib/dpkg/info/mysql-
server-5.7.postinst, i managed to "fix" it by adding a 'sleep 5' at line
317. Sleep 3 didn't cut it, it had to be sleep 5 :D
Like so:
if ! test_sysmaint_access; then
invoke stop
set_mysql_pw "debian-sys-maint" "$pass"
invoke start
echo "sleeping 5 secs"
sleep 5
fi
# mysql_upgrade returns exit status 2 if the database is already upgraded
# (LP: #1566406) so ignore its exit status if it is 2.
result=0
mysql_upgrade --defaults-file=/etc/mysql/debian.cnf || result=$?
The way to finally get rid of these issues is to add something in this
script to check if the instance is ready for connections before starting
mysql_upgrade.
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https://bugs.launchpad.net/bugs/1863318
Title:
package mysql-server-5.7 5.7.29-0ubuntu0.16.04.1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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