gnome-system-tools is broken, no maintainer any more.

To Evolution: I am using Evolution on Excalibur w/o any issues. My setup is an upgrade from Daedalus on sysvinit, LightDM and Cinnamon.

I have installed Excalibur from the netinstall into a VM and on real HW via a Ventoy stick, works fine.

Thank you Andre. Same from me.

You simply remove them. There is no de-registering required.

Well, that means there is another unfinished installation around. Well you said you tried double-clicking on a deb. I guess that's what triggers this request. No idea how to get around this.

BTW: the same problem already exists on Daedalus. Same as Excalibur. When I ask for a screenshot of a package, I get a square window with a small terminal-like icon. Thats it.

Well, Ceres is broken by definition, it is and will remain UNSTABLE in exactly the litteral meaning of this word. The software in Ceres will slowly evolve and mature and end up in Testing at some point in time. And when testing is done, the software finally will become released as stable. It will take a lot of time.

If you want a stable environment use Excalibur. It has some bugs, but it is tested and released for general use.

When you are a bit more daring you may use Testing, which currently is Freia.

Please stop complaing about Ceres is broken.

apt update
apt list openssh-server
apt install openssh-server

Per default openssh-server listens on port 22. Always (after a reboot).

I am happy with my Devuan 6 Excalibur installations, both with Cinamon as desktop. Yes there are a few nicks and glitches, but nothing I would complain too much about. And what I have seen is inherited from Debian upstream.

I fear it doesn't work that way, never did.

Best for a Linux system: set the HW clock in the Bios to UTC. Set the time zone to your region.

Then install the packages ntpsec and ntpsec-ntpdate.

Last but not least: define a time server in /etc/ntpsec/ntp.conf. Works for me.

Note: when you dual boot with Windows, you have to change the registry to also set Windows to UTC.

I never used that kind of tools.

But one thing I know for sure: Truecrypt is no more maintained for now about 12 years or so. So I am not astonished that Veracrypt is a bit more comfortable.

It called crap by the users of kvm/qemu, VMware, Proxmox etc that only consider their tooling as approriate. Others complain about the license Oracle is using. Others don't like to use a Oracle product ..... I am happy to use it for 13 years now, beginning with my first Linux only PC.

Anyway, VBox was removed from Debian because of license (always was in contrib) and versioning problems, and I think they also lacked a maintainer. So its not available in the Devuan repos. Anyhow, no big problem, the Debian way of packaging was real crap in my eyes.

What I do for many years now: I pull a .deb fitting for the corresponding Debian release from https://www.virtualbox.org/wiki/Linux_Downloads, also load the extension pack suiting to the version, and install it with dpkg -i. Only two files required, the guest addition come within the .deb.

No I am not seing this error message.

First guess: make sure that the clock on your PC is set about correct.