Your trying to modify the fedora-23 template correct?
Is sys-firewall specified as its net VM?
If not, set the fedora-23 template NetVM to sys-firewall.
Then try "sudo dnf install libreoffice"

Do your other app VM's have internet access?

If not.
Does sys-firewall have sys-net set as its "NetVM"?

==========
Ping tests
==========
Open terminal in sys-Net. Try: ping www.google.com
If that works
Open terminal in sys-firewall. Then > ping www.google.com

If there is no ping result even from sys-net, then you have to check if the 
adaptor has been asigned, and is enabled.
https://www.qubes-os.org/doc/assigning-devices/

Just so you know, you cant ping or browse internet from a template, but it 
should still be able to update, and install packages via dnf.

sometimes stopping all the VM's and restarting them fixes internet.

worst case, you could replace the fedora-23 template with a fresh one from 
qubes.

in dom0 open a terminal.
sudo qubes-dom0-update --action=reinstall qubes-template-package-name
https://www.qubes-os.org/doc/reinstall-template/

if non of that works. maybe easier to just reinstall Qubes OS?

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