To install Qortal Core in an App Qube, the prerequisites must be installed in the corresponding Template. To install Qortal Core in a Standalone, the prerequisites must be installed in the same Qube.

Install prerequisites (in Template or Standalone)

Debian:

sudo apt install openjdk-11-jdk

Fedora:

sudo dnf install java-11-openjdk

Also, if using Fedora + Tor:

sudo dnf install p7zip

Install Qortal software (in App Qube or Standalone)

wget https://github.com/Qortal/qortal/releases/latest/download/qortal.zip
unzip qortal.zip
rm qortal.zip
cd qortal
chmod +x *.sh

If using Tor:
Download a bootstrap file to the "qortal" folder using a web browser from:

Full archive options (5.6 GB):
http://bootstrap.qortal.org/bootstrap-archive.7z
http://bootstrap2.qortal.org/bootstrap-archive.7z

7za e bootstrap-archive.7z -odb
rm bootstrap-archive.7z

Top-only options (273 MB):
http://bootstrap.qortal.org/bootstrap-toponly.7z
http://bootstrap2.qortal.org/bootstrap-toponly.7z

7za e bootstrap-toponly.7z -odb
rm bootstrap-toponly.7z

If using Whonix:
Edit the "settings.json" file, and add following line, to allow for "sdwdate":

"testNtpOffset":0

If using Top-only mode:
Edit the "settings.json" file, and add following line, to enable "topOnly":

"topOnly":true