SSL Certificate download error

I installed openemr 6.0.0 with the third patch on ubuntu 20 inside virtualbox 6.1 on windows 10 host.
When filling out the info in the SSL Certificate Administration and hit download, I get this error:

Error, Class ZipArchive does not exist

Any help is greatly appreciated.

HI @Mohammad , see this q/a

Thx Stephen, this did it:

sudo apt-get install php-zip
sudo phpenmod zip
sudo service apache2 restart
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