about install

hi guys:I have already installed apache2 in Debian on my virtualbox ,and i want to install the php to support the web service .I run the commond :apt-get update                                   apt-get install php5-common libapache2-mod-php5 php5-clibut there's some erra like this :    following packages have unmet dependencies: libapache2-mod-php5:depends:libonig2(>=5.2.0)  but it is not installable                                        deoends:libqdbm14(>=1,8,74) but it is not installablephp5-cli:depends:libonig2(>=5.2.0)  but it is not installable                                        deoends:libqdbm14(>=1,8,74) but it is not installable E:Unable to correct problems, you have held broken packages. how should i do ? thanks