Обновление mysql-5.1 до 5.5 привело к сбою моего сервера с помощью dotdeb: /usr/bin/dpkg вернул код ошибки (1)

На моем Debian я недавно добавил dotdeb, чтобы мой PHP обновлялся

deb ftp://ftp.debian.ikoula.com/debian squeeze main contrib non-free
deb-src ftp://ftp.debian.ikoula.com/debian/ squeeze main contrib non-free
deb http://security.debian.org/ squeeze/updates main contrib non-free
deb-src http://security.debian.org/ squeeze/updates main contrib non-free
deb http://repo.varnish-cache.org/debian/ squeeze varnish-3.0
deb http://packages.dotdeb.org squeeze all
deb-src http://packages.dotdeb.org squeeze all

Я сделал 15 минут назад

apt-get dist-upgrade обновлять mysql от 5.1 в 5.5 и теперь у меня все мои производственные MySQL сервер потерпел крах (невозможно перезагрузить):

Затем я попытался обновить apt-get и apt-get update -f, который возвращает:

    The following packages were automatically installed and are no longer required:
  libhtml-template-perl mysql-server-core-5.1 libgd2-xpm
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  mysql-client-5.5 mysql-client-core-5.5
Suggested packages:
  libterm-readkey-perl
The following packages will be REMOVED:
  mysql-client-5.1
The following NEW packages will be installed:
  mysql-client-5.5 mysql-client-core-5.5
0 upgraded, 2 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0 B/10.4 MB of archives.
After this operation, 11.3 MB of additional disk space will be used.
Do you want to continue [Y/n]? Y
(Reading database ... 40695 files and directories currently installed.)
Unpacking mysql-client-core-5.5 (from .../mysql-client-core-5.5_5.5.27-1~dotdeb.0_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/mysql-client-core-5.5_5.5.27-1~dotdeb.0_amd64.deb (--unpack):

 trying to overwrite '/usr/bin/mysql', which is also in package mysql-client-5.1 5.1.63-0+squeeze1
configured to not write apport reports

    dpkg-deb: subprocess paste killed by signal (Broken pipe)

Errors were encountered while processing:
 /var/cache/apt/archives/mysql-client-core-5.5_5.5.27-1~dotdeb.0_amd64.deb

E: Sub-process /usr/bin/dpkg returned an error code (1)

Почему это происходит со мной? Спасибо за вашу помощь.