Errors were encountered while processing: mysql-server-5.5 ... E: Sub-process /usr/bin/dpkg returned an error code (1)

start: Job failed to start
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing mysql-server-5.5 (--configure):

subprocess installed post-installation script returned error exit status 1
No apport report written because MaxReports is reached already
Errors were encountered while processing:
mysql-server-5.5
E: Sub-process /usr/bin/dpkg returned an error code (1)


I know you have tried all these solutions that's why you are here but just take a look at once before watching my final solution which is going to work for you.

Solution : 1
Run command
sudo dpkg --configure -a
Solution : 2
Remove and install mysql server again, Run commands :
sudo apt-get --purge remove mysql-server
sudo apt-get install mysql-server

Solution : 3
Remove mysql-server and mysql-server-5.5 package from the file /var/lib/dpkg/status and reconfigure mysql-server
sudo dpkg --configure -a
But you have tried all these solutions and still you are facing same problem, try this Final Solution.
 
Final Solution
Run Command :
sudo apt-get install --reinstall apparmor
Now comment following line in the file /etc/mysql/my.cnf
skip-bdb
Restart mysql
sudo service mysql start
Now your mysql will be started.
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