I have run Vilvaldi on Devuan, but it's been a while now, so I don't know if anything has changed. You are trying it from the .deb file, right?

For Basilisk, you don't need to "install" it. Just download the correct one, extract the folder somewhere, and run the file "basilisk" from inside the "basilisk" folder. I use Pale Moon and do it the same way. I extract the folder to the Templates folder and created a shortcut on the panel for it /home/ron/Templates/palemoon/palemoon. Just replace palemoon with basilisk.

I can confirm that installing synaptic_0.91.7+nmu1_amd64.deb fixes the screenshot issue.

What I don't understand is Debian broke it by deciding to serve images from their website over https . . . why didn't they at the same time fix synaptic to receive them over https?

I guess I'm seeing a reinstall in my immediate future.

Okay, I see. Here's the correct info:

(Reading database ... 200414 files and directories currently installed.)
Preparing to unpack .../synaptic_0.91.7+nmu1_amd64.deb ...
Unpacking synaptic (0.91.7+nmu1) over (0.91.7) ...
dpkg: dependency problems prevent configuration of synaptic:
 synaptic depends on libxapian30 (>= 1.4.28~); however:
  Package libxapian30 is not installed.

dpkg: error processing package synaptic (--install):
 dependency problems - leaving unconfigured
Processing triggers for mailcap (3.74) ...
Processing triggers for desktop-file-utils (0.28-1) ...
Processing triggers for mate-menus (1.26.1-1) ...
Processing triggers for hicolor-icon-theme (0.18-2) ...
Processing triggers for man-db (2.13.1-1) ...
Errors were encountered while processing:
 synaptic

You're right, it wasn't installed. Anyway, here is a screenshot showing that it is saying it will install 115 more packages (trying to upgrade from the .deb file).

And here's the output of sudo dpkg -i /home/ ... /synaptic-build-deps_0.91.7_all.deb

Selecting previously unselected package synaptic-build-deps.
(Reading database ... 200410 files and directories currently installed.)
Preparing to unpack .../synaptic-build-deps_0.91.7_all.deb ...
Unpacking synaptic-build-deps (0.91.7) ...
dpkg: dependency problems prevent configuration of synaptic-build-deps:
 synaptic-build-deps depends on libapt-pkg-dev; however:
  Package libapt-pkg-dev is not installed.
 synaptic-build-deps depends on libgtk-3-dev; however:
  Package libgtk-3-dev is not installed.
 synaptic-build-deps depends on libvte-2.91-dev; however:
  Package libvte-2.91-dev is not installed.
 synaptic-build-deps depends on intltool; however:
  Package intltool is not installed.
 synaptic-build-deps depends on xmlto; however:
  Package xmlto is not installed.
 synaptic-build-deps depends on libsm-dev; however:
  Package libsm-dev is not installed.
 synaptic-build-deps depends on sharutils; however:
  Package sharutils is not installed.
 synaptic-build-deps depends on libxapian-dev; however:
  Package libxapian-dev is not installed.

dpkg: error processing package synaptic-build-deps (--install):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 synaptic-build-deps

I tried building something from source once, and the resultant app caused an unstable system requiring a reinstall, so I'm hesitant to try building from source again. If I do, just run these 3 commands in terminal?

git clone https://github.com/mvo5/synaptic.git
cd synaptic
debuild

Yes.

So following a link within the link given above, I found that someone has (supposedly) fixed it, here:
https://github.com/mvo5/synaptic/issues … 3616629445

Following the link in the link I just gave I found the deb installer. If I were to install it, how do I go about it? Should I purge the Synaptic now on my system, then install the fixed one?

You don't have to do it from the terminal. I don't. A few things would help to know. What desktop environment did you install with Devuan? Xfce, Mate, something else? Also it would be nice to know what text editor you use.

A few words of encouragement: the more you start to play with "Linux," the more you'll start to understand things. Everybody was a beginner once.

Why not just copy the image you want over to /usr/share/slim/themes/<theme_name>/? Then just delete the current image (or rename it to something else) and change the name of the new image to background.png/jpg.

Did you also know you can put multiple folders in /usr/share/slim/themes/ and make an edit to /etc/slim.conf so that you can have multiple images it randomly chooses from? That's what I do.

Okay, so I deleted it in /usr/lib/udev/rules.d where I accidentally put it, and then put it in /etc/udev/rules.d where it should be. Rebooted and works (again). Remarked as "SOLVED." Thanks again rolfie.

[Maybe I don't have as much of a clue as I thought I did to put it in the wrong place. ]