root@echo:/var/cache# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 mysql-server-5.1 : Depends: mysql-server-core-5.1 (= 5.1.49-3) but 5.1.63-0+squeeze1 is installed
E: Unmet dependencies. Try using -f.
root@echo:/var/cache#
root@echo:/var/cache# apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
  mysql-server-5.1
Suggested packages:
  tinyca
The following packages will be upgraded:
  mysql-server-5.1
1 upgraded, 0 newly installed, 0 to remove and 61 not upgraded.
6 not fully installed or removed.
Need to get 0 B/6,594 kB of archives.
After this operation, 20.5 kB disk space will be freed.
Do you want to continue [Y/n]? y
Reading changelogs... Done
Preconfiguring packages ...
(Reading database ... 46238 files and directories currently installed.)
Preparing to replace mysql-server-5.1 5.1.49-3 (using .../mysql-server-5.1_5.1.63-0+squeeze1_amd64.deb) ...
Stopping MySQL database server: mysqld failed!
invoke-rc.d: initscript mysql, action "stop" failed.
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
Stopping MySQL database server: mysqld failed!
invoke-rc.d: initscript mysql, action "stop" failed.
dpkg: error processing /var/cache/apt/archives/mysql-server-5.1_5.1.63-0+squeeze1_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
configured to not write apport reports
                                      Stopping MySQL database server: mysqld failed!
invoke-rc.d: initscript mysql, action "stop" failed.
Starting MySQL database server: mysqld already running.
Errors were encountered while processing:
 /var/cache/apt/archives/mysql-server-5.1_5.1.63-0+squeeze1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)