E: Unable to locate package E: Couldn't find any package by regex

Hi there,

can anyone give me a hint how to solve this issue? i am trying to install two libraries that are missing. I have tried:

- apt-get install <name_of_the_library>

but got:

E: Unable to locate package

E: Couldn't find any package by regex

the following did not help either:

-apt-get install apt-file

-apt-get upgrade

-apt-get update

-apt-get install apache2

Last thing: I can actually locate the libraries when I run find command!!! so i have no idea what is going on here. Thanks!

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