Catalina installs the same way as Mojave.
Tested with macOS Big sur with OpenCore-0.7.4-RELEASE.zip release in October, 2021.
Note: Use create_iso_catalina.sh
for generating a macOS Catalina based "ISO"
(actually DMG) image.
Attention: Use 64-bit Ubuntu 20.04 LTS or later as the host OS for "best" results. Guestfish output results may vary across platforms.
# Normal OpenCore Image
rm -f OpenCore.qcow2; sudo ./opencore-image-ng.sh --cfg config.plist --img OpenCore.qcow2
Note: https://github.com/thenickdude/KVM-Opencore is one of the best resources
for customizing OpenCore.qcow2
. Thanks Nick! :)