我目前正在运行 debian 8，我想升级 debian 提供的安全补丁，但问题是，如果我升级单个软件包，它会要求升级许多软件包，如下所示：
$ apt-get upgrade openssl
The following packages will be upgraded:
dpkg dpkg-dev krb5-locales libapache2-mod-php5 libdpkg-perl libfreetype6 libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libgssapi-krb5-2
libk5crypto3 libkrb5-3 libkrb5support0 libpng12-0 libssl1.0.0 linux-headers-3.2.0-4-amd64 linux-headers-3.2.0-4-common
linux-image-3.2.0-4-amd64 linux-libc-dev ntp php5 php5-cli php5-common php5- curl php5-readline tzdata unzip virtualbox virtualbox-dkms
virtualbox-qt....too many
The following packages have been kept back:
acpid anacron apt-xapian-index aptitude aptitude-common aspell-de at at- spi2-core avahi-daemon base-passwd bind9-host binfmt-support
bsdutils consolekit cron cryptsetup-bin db5.1-util dbus default-jre default- jre-headless dictionaries-common dmsetup dnsmasq-base
dnsutils dovecot-core …