>From log (translated):
Setting up mysql-server-5.1 (5.1.54-1ubuntu4) ...
110 804 17:19:21 [Note] Plugin 'FEDERATED' is disabled.
110 804 17:19:21 InnoDB: Initializing buffer pool, size = 8.0M
110 804 17:19:21 InnoDB: Completed initialization of buffer pool
110 804 17:19:22 InnoDB: Started; lo
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https://bugs.launchpad.net/bugs/820953
Title:
package mysql-server-5.1 5.1.54-1ubuntu4 failed to install/upgrade:
подпроцесс установлен сценарий post-installation