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I want to install php5-imap php5-ldap php5-curl

sudo apt-get install php5-imap php5-ldap php5-curl

I get this error:

AppArmor parser error for /etc/apparmor.d/usr.sbin.mysqld in /etc/apparmor.d/usr.sbin.mysqld at line 9: Could not open 'abstractions/mysql'

How can this problem be resolved?

See if the Ubuntu wiki helps : https://wiki.ubuntu.com/DebuggingApparmor

Specifically,

When debugging, it may also be useful
to put apparmor into 'complain' mode.
This will allow your application to
function normally while apparmor
reports accesses that are not in the
profile. To enable 'complain' mode,
use:

sudo aa-complain /path/to/bin

where '/path/to/bin' is the absolute
path to the binary, as reported in the
'profile=...' portion of the 'audit'
entry. Eg:

sudo aa-complain /usr/sbin/slapd

To re-enable enforcing mode, use
'aa-enforce' instead:

sudo aa-enforce /path/to/bin

To disable a profile:

sudo touch /etc/apparmor.d/disable/path.to.bin

sudo apparmor_parser -R /etc/apparmor.d/path.to.bin

To disable a profile in Ubuntu 10.10 and earlier:

sudo touch /etc/apparmor.d/disable/path.to.bin sudo apparmor_parser -R /etc/apparmor.d/path.to.bin

in 11.04 and later:

sudo aa-disable /etc/apparmor.d/path.to.bin

To disable all of AppArmor
for testing purposes, boot with apparmor=0 on the kernel command
line.

It is an old question, but maybe someone will find it useful.

Sometimes pieces of application are split in separate packages. Same goes for apparmor profiles. They are split in packages apparmor-profiles and apparmor-profiles-extra. So, if you have some profiles missing, install apparmor-profiles-extra.

You are missing the file abstractions/mysql. This happened to me when I tried to completely remove MySQL before reinstalling it. I fixed this issue by replacing the file with a copy from another server. The contents of my file looks something like this:

# ------------------------------------------------------------------

#

#    Copyright (C) 2002-2006 Novell/SUSE

#    Copyright (C) 2013 Christian Boltz

#

#    This program is free software; you can redistribute it and/or

#    modify it under the terms of version 2 of the GNU General Public

#    License published by the Free Software Foundation.

#

# ------------------------------------------------------------------



   /var/lib/mysql{,d}/mysql{,d}.sock rw,

   /{var/,}run/mysql{,d}/mysql{,d}.sock rw,

   /usr/share/{mysql,mysql-community-server,mariadb}/charsets/ r,

   /usr/share/{mysql,mysql-community-server,mariadb}/charsets/*.xml r,

Try creating the file and adding the above contents with:

sudo nano /etc/apparmor.d/abstractions/mysql