Installation error on Ubuntu 6.06

[DirtyMonkey]

I finally bit the bullet and am leasing Plesk 100 user license + Powerpack etc.

I have incountered many problems whislt installing on my dedicated server (Ubuntu 6.06 LTS) and I think I'm almost there but I get the following error using the auto-installer:

WARNING: The following packages cannot be authenticated!
psa-api-rpc php5 php5-ioncube-loader psa-autoinstaller
psa-awstats-configurator psa-horde psa-hotfix3 psa-hotfix4 psa-imp psa-ingo
psa-kronolith psa-mimp psa-mnemo psa-passwd psa-turba psa-updates
Authentication warning overridden.
Setting up psa (8.3.0-ubuntu6.06.build83071218.20) ...
Setting the default locale
The default locale is set to en-US (ENGLISH, UNITED STATES)

mv: cannot stat `/opt/psa/tmp/psa.key': No such file or directory

ERROR while trying to install psa default key
Check the error reason(see log file: /tmp/psa_8.3.0_ubuntu6.06.build83071218.20_installing.080405.18.00.log), fix and try again

Aborting...

dpkg: error processing psa (--configure):
subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
psa
E: Sub-process /usr/bin/dpkg returned an error code (1)

I have read something about making sure you install from a 'base' directory but I'm new to Linux and have no idea what it means or how to resolve this issue.

Any assistance would be most appreciated.

DM.

 

[DirtyMonkey]

I found this thread:
http://kb.swsoft.com/en/937

What would be the Ubuntu equivalent of:

# rpm -Uvh ./*

Thanks in advance, DM.