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Can't install plesk, please help!

This part of the output is your problem:

Warning!
Unable to determine the host or domain name of your computer.
Setting it to localhost.localdomain
Unable to resolve host name.
Please specify the host name in the /etc/hosts file
or specify DNS configuration in the /etc/resolv.conf file on your system.

ERROR while trying to check the hostname

Make sure your hostname is set up correctly and that it can be resolved, before starting the installation.
 
Hi,

see http://kb.odin.com/en/1137 for more details on this issue.
I believe you will need to correct hostname or use workaround from this article and then rerun installation by either manually reinstalling Plesk packages or running 'apt get -f install' (but behavior of this command can be different depending on state of other packages in system so reinstalling packages manually is better option).
 
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