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If you use Horde with IE 8 you can't open "Webmail" and "Kalender" in the left navigation.
It works if you change to "Compatibility View".
is it a Horde bug ?
i think you have a problem in your "/etc/apt/sources.list", you need to add the plesk source:
deb http://autoinstall.plesk.com/debian/PSA_9.2.1 etch all
just add
deb http://autoinstall.plesk.com/debian/PSA_9.0.1 etch all
to your "/etc/apt/sources.list" if it is not allready there and then run
apt-get install psa-horde psa-atmail
sorry i can't see your problem, plesk normaly not need a exclusive ip for every domain.
there is no button or something in plesk to use NameVirtualHost, plesk just create it with the apache NameVirtualHost....
have you tried the force option too ?
apt-get -f install php5-xsl php5-curl libapache2-mod-php5 php5-imap php5-mysql php5-cli php5 php5-gd
or try
aptitude dist-upgrade
da fehlt auf jeden Fall noch das plesk repository, ergänze mal:
deb http://autoinstall.plesk.com/debian/PSA_9.0.1 etch all
danach versuch mal:
aptitude update
aptitude upgrade