Public bug reported:

On Ubuntu 16.04.6 LTS, after apt purge mysql-server* then apt install
mysql-server the intallation fails because the AppArmor profile is
incomplete. Booting with kernel command line parameter apparmor=0 allows
successful install.

Running aa-logprof shows that the pid file is not in the profile based
on the following output:

Profile:  /usr/sbin/mysqld
Path:     /run/mysqld/mysql.pid
Mode:     rw
Severity: unknown

 [1 - /run/mysqld/mysql.pid]
[(A)llow] / (D)eny / (I)gnore / (G)lob / Glob with (E)xtension / (N)ew / 
Abo(r)t / (F)inish / (M)ore
Adding /run/mysqld/mysql.pid rw to profile


Debugging info:


cat /etc/issue

Ubuntu 16.04.6 LTS \n \l


---

apt-cache policy mysql-server*

mysql-server-5.0:
  Installed: (none)
  Candidate: (none)
  Version table:
mysql-server-5.1:
  Installed: (none)
  Candidate: (none)
  Version table:
mysql-server-5.5:
  Installed: (none)
  Candidate: (none)
  Version table:
mysql-server-5.6:
  Installed: (none)
  Candidate: (none)
  Version table:
mysql-server-5.7:
  Installed: 5.7.25-0ubuntu0.16.04.2
  Candidate: 5.7.25-0ubuntu0.16.04.2
  Version table:
 *** 5.7.25-0ubuntu0.16.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     5.7.11-0ubuntu6 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
mysql-server:
  Installed: 5.7.25-0ubuntu0.16.04.2
  Candidate: 5.7.25-0ubuntu0.16.04.2
  Version table:
 *** 5.7.25-0ubuntu0.16.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 
Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages
        100 /var/lib/dpkg/status
     5.7.11-0ubuntu6 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages
mysql-server-core-5.1:
  Installed: (none)
  Candidate: (none)
  Version table:
mysql-server-core-5.5:
  Installed: (none)
  Candidate: (none)
  Version table:
mysql-server-core-5.6:
  Installed: (none)
  Candidate: (none)
  Version table:
mysql-server-core-5.7:
  Installed: 5.7.25-0ubuntu0.16.04.2
  Candidate: 5.7.25-0ubuntu0.16.04.2
  Version table:
 *** 5.7.25-0ubuntu0.16.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     5.7.11-0ubuntu6 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

** This system was upgraded from 14.04 using do-upgrade-release **

** Affects: mysql-5.7 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1825246

Title:
  Mysql 5.7 mysql.pid Apparmor Denial

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