Mora

I use Karakeep with Floccus and it works really nice.

Incus is designed to be a Hypervisor (e.g. like Proxmox / VMware). So it is fully intended to not be able to fuck around on the host system as you are supposed to create VMs and containers in which you can do that.

use the fediverse through threads or bluesky

Bluesky is not part of the fediverse and threads is mostly technically capable to be part of it - it is however blocked from the most other instances.