I can't install packages with conda, even so anaconda was correctly installed? (Fresh Ubuntu 20.04 LTS Setup)

I wanted to install pandas on my fresh installation of Ubuntu 20.04 LTS (updated it first).

What i did: I followed the installation instructions on:

https://docs.anaconda.com/anaconda/install/linux/ (debian version, but with 'sudo apt' instead of 'apt-get')

The installation went through nicely. The sha256 were identical as well. I followed every recommended step and even verified my installation (anaconda-navigator opens for example)

My issue now: pandas can't be installed since it keeps throwing error like:

Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.

(it keeps finding incompatible packages, if you let the "installation" continue)

After that, i wanted to uninstall anaconda, but i can't even install anaconda-clean, which should be the uninstall package (same issues).

My question:

Did i miss something important, that i might have skipped?

In the best case scenario, i would like to install pandas via conda. In the worst case scenario, i would like to uninstall anaconda with anaconda-clean.

The anaconda i used for the installation: Anaconda3-2021.05-Linux-x86_64.sh

Another complete reinstall (Ubuntu 20.04 LTS) and using 'sudo apt-get' instead of 'sudo apt' for anaconda did the trick?

I still have no clue what might gone wrong the first time. pandas gets installed alongside anaconda fyi.

Not sure if everything will work now, but at least import pandas doesn't throw an exception.