You seem to have had some other version of mysql installed:
Setting up mysql-community-server (5.6.38-1ubuntu14.04) ...
./usr/bin/mysqld_safe: 637: /usr/bin/mysqld_safe: cannot create
/usr/data/admin-3046.err: Directory nonexistent
Logging to '/usr/data/admin-3046.err'.
What is this community server? Version 5.6.38 is not available for trusty in
the ubuntu archive:
$ rmadison mysql-server-core-5.5
mysql-server-core-5.5 | 5.5.22-0ubuntu1 | precise | amd64,
armel, armhf, i386, powerpc
mysql-server-core-5.5 | 5.5.35+dfsg-1ubuntu1 | trusty | amd64,
arm64, armhf, i386, powerpc, ppc64el
mysql-server-core-5.5 | 5.5.54-0ubuntu0.12.04.1 | precise-security | amd64,
armel, armhf, i386, powerpc
mysql-server-core-5.5 | 5.5.54-0ubuntu0.12.04.1 | precise-updates | amd64,
armel, armhf, i386, powerpc
mysql-server-core-5.5 | 5.5.58-0ubuntu0.14.04.1 | trusty-security | amd64,
arm64, armhf, i386, powerpc, ppc64el
mysql-server-core-5.5 | 5.5.58-0ubuntu0.14.04.1 | trusty-updates | amd64,
arm64, armhf, i386, powerpc, ppc64el
Did you move from this 5.6.38 community version to the ubuntu version
which is 5.5.58 and that's when the error happened?
** Changed in: mysql-5.5 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1734444
Title:
package mysql-server-5.5 5.5.58-0ubuntu0.14.04.1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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