Переход сервера на Debian Wheezy

Было:

# lsb_release -a
Distributor ID: Debian
Description:    Debian GNU/Linux 6.0.10 (squeeze)
Release:    6.0.10
Codename:   squeeze

Стало:

# lsb_release -a
Distributor ID: Debian
Description:    Debian GNU/Linux 7.9 (wheezy)
Release:    7.9
Codename:   wheezy