2. Open a terminal in Debian 11 (or your previously chosen template ; note that `gnome-terminal` isn't installed by default in a [minimal template], in which case replace `gnome-terminal` with `uxterm`):
Install the curl program needed to download the signal signing key:
sudo apt install curl
We need a notification daemon, otherwise signal will hang the first time you receive a message when the window doesn’t have the focus (alternatively you could install `xfce4-notifyd` instead of `dunst`):
sudo apt install dunst
Download the signal signing key (we need to pass the `--proxy` argument to `curl` as TemplateVMs can only access internet through a proxy at localhost/127.0.0.1 port 8082):
curl --proxy 127.0.0.1:8082 -s https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor | sudo tee -a /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null
Add the signal repository (if you chose a different distribution, such as `buster`, substitute that for `xenial`):
echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main' | sudo tee -a /etc/apt/sources.list.d/signal-xenial.list
Then fetch all repositories (now including the newly added signal repository), bring the TemplateVM up-to-date, and finally install signal:
4. A bit more work is required in case you used a minimal template for the TemplateVM above:
`signal-desktop` requires at the minimum `libatk1.0-0`, `libatk-bridge2.0-0`, `libcups2` and `libgtk-3-0` to run. Those dependencies are automatically installed when installing `xfce4-notifyd`, but if you installed `dunst` you'll have to add them:
If you haven't done so already, `qubes-core-agent-networking` must be installed for networking to work in qubes which are based on minimal templates:
sudo apt install qubes-core-agent-networking
Then optionally install the following packages for convenience of handling files (`zenity` is needed by the Qubes OS functions in `qubes-core-agent-nautilus` to show the progress dialog when moving / copying files):
7. With your mouse, select the `Q` menu -> `Domain: "AppVM Name"` -> `"AppVM Name": Qube Settings` -> `Applications` (or in Qubes Manager `"AppVM Name"` -> `Settings` -> `Applications`). Select `Signal` from the left `Available` column, move it to the right `Selected` column by clicking the `>` button and then `OK` to apply the changes and close the window.
