Error during installation on ubuntu

[Celao]

Hello,

I'm trying to install Plesk on ubuntu, but always end on same error.
This is the log of instalattion:

---------------- BEGIN OF PASTE ---------------
Setting up apache2-mpm-prefork (2.2.4-3ubuntu0.1) ...
* Starting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
[ OK ]

Setting up php5-common (5.2.3-1ubuntu6.3) ...
Setting up libapache2-mod-php5 (5.2.3-1ubuntu6.3) ...

Creating config file /etc/php5/apache2/php.ini with new version
* Reloading web server config apache2 7822
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
[ OK ]

Processing triggers for libc6 ...
ldconfig deferred processing now taking place
Selecting previously deselected package psa-php5-configurator.
(Reading database ... 100200 files and directories currently installed.)
Unpacking psa-php5-configurator (from .../psa-php5-configurator_1.3.0-ubuntu7.10.build83071218.20_all.deb) ...
Setting up gawk (1:3.1.5.dfsg-4ubuntu1) ...

Setting up libnet-daemon-perl (0.38-1.1) ...
Setting up libplrpc-perl (0.2017-1.1) ...
Setting up libdbi-perl (1.57-1) ...
Setting up libmysqlclient15off (5.0.45-1ubuntu3.3) ...

Setting up libdbd-mysql-perl (4.004-2) ...
Setting up mysql-client-5.0 (5.0.45-1ubuntu3.3) ...

Setting up mysql-server-5.0 (5.0.45-1ubuntu3.3) ...
* Stopping MySQL database server mysqld [ OK ]
* Starting MySQL database server mysqld [ OK ]
* Checking for corrupt, not cleanly closed and upgrade needing tables.

Processing triggers for libc6 ...
ldconfig deferred processing now taking place
Selecting previously deselected package psa.
(Reading database ... 100204 files and directories currently installed.)
Unpacking psa (from .../psa_8.3.0-ubuntu7.10.build83071218.20_i386.deb) ...
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
Check the error reason(see log file: /tmp/psa_8.3.0_ubuntu7.10.build83071218.20_installing.080407.00.14.log), fix and try again

Aborting...

dpkg: error processing /var/cache/apt/archives/psa_8.3.0-ubuntu7.10.build83071218.20_i386.deb (--unpack):
subprocess pre-installation script returned error exit status 1
E: Sub-process /usr/bin/dpkg returned an error code (1)
Get:1 http://br.archive.ubuntu.com gutsy Release.gpg [191B]
Get:2 http://br.archive.ubuntu.com gutsy-updates Release.gpg [191B]
Hit http://br.archive.ubuntu.com gutsy Release
Hit http://br.archive.ubuntu.com gutsy-updates Release
Hit http://br.archive.ubuntu.com gutsy/main Packages
Hit http://br.archive.ubuntu.com gutsy/restricted Packages
Hit http://br.archive.ubuntu.com gutsy/main Sources
Hit http://br.archive.ubuntu.com gutsy/restricted Sources
Hit http://br.archive.ubuntu.com gutsy/universe Packages
Hit http://br.archive.ubuntu.com gutsy/universe Sources
Hit http://br.archive.ubuntu.com gutsy/multiverse Packages
Hit http://br.archive.ubuntu.com gutsy/multiverse Sources
Hit http://br.archive.ubuntu.com gutsy-updates/main Packages
Hit http://br.archive.ubuntu.com gutsy-updates/restricted Packages
Hit http://br.archive.ubuntu.com gutsy-updates/main Sources
Hit http://br.archive.ubuntu.com gutsy-updates/restricted Sources
Hit http://br.archive.ubuntu.com gutsy-updates/universe Packages
Hit http://br.archive.ubuntu.com gutsy-updates/universe Sources
Hit http://br.archive.ubuntu.com gutsy-updates/multiverse Packages
Hit http://br.archive.ubuntu.com gutsy-updates/multiverse Sources
Get:3 http://security.ubuntu.com gutsy-security Release.gpg [191B]
Hit http://security.ubuntu.com gutsy-security Release
Hit http://security.ubuntu.com gutsy-security/main Packages
Hit http://security.ubuntu.com gutsy-security/restricted Packages
Hit http://security.ubuntu.com gutsy-security/main Sources
Hit http://security.ubuntu.com gutsy-security/restricted Sources
Hit http://security.ubuntu.com gutsy-security/universe Packages
Hit http://security.ubuntu.com gutsy-security/universe Sources
Hit http://security.ubuntu.com gutsy-security/multiverse Packages
Hit http://security.ubuntu.com gutsy-security/multiverse Sources
Fetched 3B in 1s (2B/s)
Reading package lists...
ERROR: An error occurred on attempt to install packages.
Attention! Your software might be inoperable.
Please, contact product technical support.

---------------- END OF PASTE ---------------

I tried to install again, but ended on same error again.
What shoul i do?

Sorry my english!

Thanks