title: Unable to install MySQL on ubuntu (elementary os)
body: <p>I'm trying to install mysql on my laptop but during installation I get this error:</p>
  
  <pre><code>131217 15:59:42 [Note] Plugin 'FEDERATED' is disabled.
  131217 15:59:42 InnoDB: The InnoDB memory heap is disabled
  131217 15:59:42 InnoDB: Mutexes and rw_locks use GCC atomic builtins
  131217 15:59:42 InnoDB: Compressed tables use zlib 1.2.3.4
  131217 15:59:42 InnoDB: Initializing buffer pool, size = 256.0M
  131217 15:59:42 InnoDB: Completed initialization of buffer pool
  131217 15:59:42 InnoDB: highest supported file format is Barracuda.
  131217 15:59:42  InnoDB: Waiting for the background threads to start
  131217 15:59:43 InnoDB: 5.5.34 started; log sequence number 1595675
  131217 15:59:43 [ERROR] /usr/sbin/mysqld: unknown variable 'log_slow_verbosity=query_plan'
  131217 15:59:43 [ERROR] Aborting
  
  131217 15:59:43  InnoDB: Starting shutdown...
  131217 15:59:44  InnoDB: Shutdown completed; log sequence number 1595675
  131217 15:59:44 [Note] /usr/sbin/mysqld: Shutdown complete
  
  start: Job failed to start
  invoke-rc.d: initscript mysql, action "start" failed.
  dpkg: errors were encountered while processing: mysql-server-5.5 (--configure):
  podproces instalovaný post-installation skript vrátil chybový status 1
  Žádné apport hlášení nebylo vytvořeno, protože již byl dosažen MaxReports
  dpkg: nesplněné závislosti zamezily konfiguraci balíku mysql-server:
  mysql-server závisí na mysql-server-5.5; avšak:
  Balík mysql-server-5.5 zatím není zkonfigurován.
  dpkg: chyba při zpracovávání mysql-server (--configure):
  problém se závislostmi - nechávám nezkonfigurované
  Žádné apport hlášení nebylo vytvořeno, protože již byl dosažen MaxReports
  Nastavuji balík             libmariadbclient18 (10.0.6+maria-1~precise) …
  Zpracování spouštěčů pro balík libc-bin …
  ldconfig deferred processing now taking place
  Errors were encountered while processing:
  mysql-server-5.5
  mysql-server
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  </code></pre>
  
  <p>I can't currently switch languages so I hope you will not get confused.
  I tried to purge previous installation and do it again but there is no difference.</p>
  
  <p>Could anyone tell me whats wrong?</p>