Installing bandwidth limiter, multiple errors: component __asp_unix not installed

[Knarf]

Parallels Plesk Panel v10.1.1, OS: Ubuntu 10.04 x86_64, 41 clients, 58 domains

During an install of the bandwidth limiter package, in the pp10.10.1-bootstrapper log multiple errors where generated like the following one, one error for each domain:

2011-02-07T22:34:19+01:00 ERR (3): Unable to apply plan changes to domain <**domain**>.nl. Error: The plan was not applied: Het component __asp_unix_support is niet geïnstalleerd, Het component __php_support is niet geïnstalleerd, phosting__php_handler_type_not_supported, Het component __perl_unix_support is niet geïnstalleerd, Het component __python_unix_support is niet geïnstalleerd, Het component fastcgi is niet geïnstalleerd, Het component __miva_unix_support is niet geïnstalleerd

The bandwidth limiter and connection checkboxes are available though.

Are these errors something to worry about?

 

[Knarf]

Is it possible that some packages in my Ubuntu 10.04 are missing, such as ASP support?

In the error log, it is reported that these components are not installed: asp_unix_support, php_support, php_handler_type, perl_unix_support, python_unix_support, fastcgi, miva_unix_support.
How do I know which packages exactly are needed, and what is the best way to fix this?