[Wien] Missing packages

[delamora]

Dear WIEN2k Comunity,
I am installing the WIEN2k 19.1 version in Ubuntu 20.04 and I try to install;

perl-Math-Complex.noarch
libXScrnSaver
compat-libstdc++-33

I get as an answer
package cannot be found
Any suggestion is welcome

Saludos

Pablo
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