updated install instructions (#676)

Signed-off-by: Toni Förster <[email protected]>

download.md

@@ -3,19 +3,19 @@ layout: page
 title: Download ET
 ---
 
-# OS/X
+# macOS
 
-The easiest way to install is using homebrew:
+The easiest way to install, is using [Homebrew](https://brew.sh):
 
-```
+```bash
 brew install MisterTea/et/et
 ```
 
 # Ubuntu
 
 For Ubuntu, use our PPA:
 
-```
+```bash
 sudo apt-get install -y software-properties-common
 sudo add-apt-repository ppa:jgmath2000/et
 sudo apt-get update
@@ -24,27 +24,33 @@ sudo apt-get install et
 
 # Debian
 
-For Debian, use our deb repo.  For bullseye:
+For Debian, use our deb repo:
 
-```
-echo "deb https://mistertea.github.io/debian-et/debian-source/ bullseye main" | sudo tee /etc/apt/sources.list.d/et.list
-curl -sS https://mistertea.github.io/debian-et/et.gpg | sudo apt-key add -
+```bash
+echo "deb [signed-by=/etc/apt/keyrings/et.gpg] https://mistertea.github.io/debian-et/debian-source/ $(grep VERSION_CODENAME /etc/os-release | cut -d= -f2) main" | sudo tee -a /etc/apt/sources.list.d/et.list
+curl -sSL https://github.com/MisterTea/debian-et/raw/master/et.gpg | sudo tee /etc/apt/keyrings/et.gpg >/dev/null
 sudo apt update
 sudo apt install et
 ```
-See [the repo source](https://github.com/MisterTea/debian-et/tree/master/debian-source/dists) for a list of the other supported Debian versions.
+
+If you're using **Debian 11 or older**, before adding the repo, you must create the `keyrings` folder first:
+
+```bash
+sudo mkdir -m 0755 -p /etc/apt/keyrings
+```
+
+See [the repo source](https://github.com/MisterTea/debian-et/tree/master/debian-source/dists) for a list of all supported Debian versions.
 
 # Other Linux/Unix
 
-Check out the [README](https://github.com/MisterTea/EternalTerminal) for instructions.
+Check out the [README](https://github.com/MisterTea/EternalTerminal#installing) for instructions.
 
 # Windows
 
-ET works under WSL (Windows Subsystem for Linux), but you must be running xenial or higher.  See this issue for details: https://github.com/microsoft/WSL/issues/482
-
-As long as you are running Xenial, you can follow the ubuntu instructions for installation.
+ET works under [WSL (Windows Subsystem for Linux)](https://learn.microsoft.com/en-us/windows/wsl/).
 
+As long as you are running Ubuntu, you can follow the [Ubuntu instructions](https://eternalterminal.dev/download/#ubuntu) for installation, but you must be **running `Ubuntu-16.04` or newer**. See [this issue](https://github.com/microsoft/WSL/issues/482) for details.
 
 # Source Code
 
-The source can be found on our [github page](https://github.com/MisterTea/EternalTerminal)
+The source can be found on our [GitHub page](https://github.com/MisterTea/EternalTerminal).