I don’t have the Ubuntu software center on 20.4
It really should not matter if you are running Ubuntu in a Virtual Machine. Although I have no knowledge of Ṕarallels’, I think the software center should be there.
Seeing this video https://www.google.com/search?client=firefox-b-d&q=install+ubuntu+in+parallels#kpvalbx=_fPJnYtHQLNSDur4PzqKAoAc13 (it is on youtube), I see that it is more limited though. Might be that is due to being the ARM version.
Look what software is installed. And then use the command-line (terminal).
Install
You can install Ubuntu Software like so:
sudo apt install ubuntu-software
or install Gnome Software in newer releases of Ubuntu like so:
sudo apt install gnome-software
Reinstall
You can reinstall Ubuntu Software like so:
sudo apt install --reinstall ubuntu-software
or reinstall Gnome Software in newer releases of Ubuntu like so:
sudo apt install --reinstall gnome-software
Reset
You can reset Ubuntu Software to its vanilla settings.
First, purge it like so:
sudo apt purge ubuntu-software
Then, install it like so:
sudo apt install ubuntu-software
or reset Gnome Software in newer releases of Ubuntu.
First, purge it like so:
sudo apt purge gnome-software
Then, install it like so:
sudo apt install gnome-software
It works the same for Zoom.
Sudo apt install zoom